8156991532800 has 864 divisors, whose sum is σ = 29648877350400. Its totient is φ = 1958584320000.

The previous prime is 8156991532799. The next prime is 8156991532819. The reversal of 8156991532800 is 82351996518.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17694124570 + ... + 17694125030.

Almost surely, 2^{8156991532800} is an apocalyptic number.

8156991532800 is a gapful number since it is divisible by the number (80) 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 8156991532800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14824438675200).

8156991532800 is an abundant number, since it is smaller than the sum of its proper divisors (21491885817600).

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

8156991532800 is a wasteful number, since it uses less digits than its factorization.

8156991532800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1102 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 57.

The spelling of 8156991532800 in words is "eight trillion, one hundred fifty-six billion, nine hundred ninety-one million, five hundred thirty-two thousand, eight hundred".