156427369081 has 3 divisors (see below), whose sum is σ = 156427764591. Its totient is φ = 156426973572.

The previous prime is 156427369069. The next prime is 156427369117. The reversal of 156427369081 is 180963724651.

The square root of 156427369081 is 395509.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 180963724651 = 3323 ⋅54457937.

It can be written as a sum of positive squares in only one way, i.e., 121585413481 + 34841955600 = 348691^2 + 186660^2 .

It is not a de Polignac number, because 156427369081 - 2⁹ = 156427368569 is a prime.

It is a super-2 number, since 2×156427369081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156427369381) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 197755 + ... + 593263.

It is an arithmetic number, because the mean of its divisors is an integer number (52142588197).

It is a 1-persistent number, because it is pandigital, but 2⋅156427369081 = 312854738162 is not.

Almost surely, 2^156427369081 is an apocalyptic number.

156427369081 is the 395509-th square number.

156427369081 is the 197755-th centered octagonal number.

It is an amenable number.

156427369081 is a deficient number, since it is larger than the sum of its proper divisors (395510).

156427369081 is an frugal number, since it uses more digits than its factorization.

156427369081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791018 (or 395509 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 156427369081 in words is "one hundred fifty-six billion, four hundred twenty-seven million, three hundred sixty-nine thousand, eighty-one".