81157602832 has 20 divisors (see below), whose sum is σ = 159396869500. Its totient is φ = 40022926848.

The previous prime is 81157602817. The next prime is 81157602833. The reversal of 81157602832 is 23820675118.

It can be written as a sum of positive squares in 2 ways, for example, as 26197364736 + 54960238096 = 161856^2 + 234436^2 .

It is not an unprimeable number, because it can be changed into a prime (81157602833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34740957 + ... + 34743292.

It is an arithmetic number, because the mean of its divisors is an integer number (7969843475).

Almost surely, 2^81157602832 is an apocalyptic number.

It is an amenable number.

81157602832 is a deficient number, since it is larger than the sum of its proper divisors (78239266668).

81157602832 is a wasteful number, since it uses less digits than its factorization.

81157602832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69484330 (or 69484324 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 81157602832 in words is "eighty-one billion, one hundred fifty-seven million, six hundred two thousand, eight hundred thirty-two".