81852367264 has 48 divisors (see below), whose sum is σ = 169483829760. Its totient is φ = 38858676480.

The previous prime is 81852367237. The next prime is 81852367273. The reversal of 81852367264 is 46276325818.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725844 + ... + 830995.

It is an arithmetic number, because the mean of its divisors is an integer number (3530913120).

Almost surely, 2^81852367264 is an apocalyptic number.

It is an amenable number.

81852367264 is an abundant number, since it is smaller than the sum of its proper divisors (87631462496).

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

81852367264 is a wasteful number, since it uses less digits than its factorization.

81852367264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556933 (or 1556925 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 52.

The spelling of 81852367264 in words is "eighty-one billion, eight hundred fifty-two million, three hundred sixty-seven thousand, two hundred sixty-four".