156231991296 has 340 divisors, whose sum is σ = 491647321000. Its totient is φ = 49304567808.

The previous prime is 156231991291. The next prime is 156231991309. The reversal of 156231991296 is 692199132651.

156231991296 is a `hidden beast` number, since 1 + 5 + 623 + 1 + 9 + 9 + 1 + 2 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156231991291) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 100859130 + ... + 100860678.

Almost surely, 2^156231991296 is an apocalyptic number.

156231991296 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 156231991296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245823660500).

156231991296 is an abundant number, since it is smaller than the sum of its proper divisors (335415329704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

156231991296 is an frugal number, since it uses more digits than its factorization.

156231991296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612 (or 1573 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 54.

The spelling of 156231991296 in words is "one hundred fifty-six billion, two hundred thirty-one million, nine hundred ninety-one thousand, two hundred ninety-six".