156738312781 has 4 divisors (see below), whose sum is σ = 158626726272. Its totient is φ = 154849899292.

The previous prime is 156738312737. The next prime is 156738312877. The reversal of 156738312781 is 187213837651.

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 a cyclic number.

It is not a de Polignac number, because 156738312781 - 2¹¹ = 156738310733 is a prime.

It is a super-2 number, since 2×156738312781² (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 (156738319781) 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, 944206621 + ... + 944206786.

It is an arithmetic number, because the mean of its divisors is an integer number (39656681568).

Almost surely, 2^156738312781 is an apocalyptic number.

It is an amenable number.

156738312781 is a deficient number, since it is larger than the sum of its proper divisors (1888413491).

156738312781 is an equidigital number, since it uses as much as digits as its factorization.

156738312781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888413490.

The product of its digits is 1693440, while the sum is 52.

The spelling of 156738312781 in words is "one hundred fifty-six billion, seven hundred thirty-eight million, three hundred twelve thousand, seven hundred eighty-one".