156521651061 has 4 divisors (see below), whose sum is σ = 208695534752. Its totient is φ = 104347767372.

The previous prime is 156521651057. The next prime is 156521651101. The reversal of 156521651061 is 160156125651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 156521651061 - 2² = 156521651057 is a prime.

It is a super-2 number, since 2×156521651061² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156521651021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26086941841 + ... + 26086941846.

It is an arithmetic number, because the mean of its divisors is an integer number (52173883688).

Almost surely, 2^156521651061 is an apocalyptic number.

It is an amenable number.

156521651061 is a deficient number, since it is larger than the sum of its proper divisors (52173883691).

156521651061 is an equidigital number, since it uses as much as digits as its factorization.

156521651061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52173883690.

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 156521651061 in words is "one hundred fifty-six billion, five hundred twenty-one million, six hundred fifty-one thousand, sixty-one".