81160032996 has 675 divisors, whose sum is σ = 277498008249. Its totient is φ = 20675886336.

The previous prime is 81160032991. The next prime is 81160033021. The reversal of 81160032996 is 69923006118.

It is a happy number.

The square root of 81160032996 is 284886.

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

81160032996 is a `hidden beast` number, since 8 + 1 + 1 + 600 + 32 + 9 + 9 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63186876900 + 17973156096 = 251370^2 + 134064^2 .

It is not an unprimeable number, because it can be changed into a prime (81160032991) by changing a digit.

It is a polite number, since it can be written in 224 ways as a sum of consecutive naturals, for example, 4271580675 + ... + 4271580693.

Almost surely, 2^81160032996 is an apocalyptic number.

81160032996 is the 284886-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81160032996

81160032996 is an abundant number, since it is smaller than the sum of its proper divisors (196337975253).

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

81160032996 is a wasteful number, since it uses less digits than its factorization.

81160032996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 81160032996 in words is "eighty-one billion, one hundred sixty million, thirty-two thousand, nine hundred ninety-six".