81659370321852 has 48 divisors (see below), whose sum is σ = 195046091235072. Its totient is φ = 26576349206400.

The previous prime is 81659370321827. The next prime is 81659370321899. The reversal of 81659370321852 is 25812307395618.

It is a super-2 number, since 2×81659370321852² (a number of 29 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29701833 + ... + 32334464.

It is an arithmetic number, because the mean of its divisors is an integer number (4063460234064).

Almost surely, 2^{81659370321852} is an apocalyptic number.

It is an amenable number.

81659370321852 is an abundant number, since it is smaller than the sum of its proper divisors (113386720913220).

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

81659370321852 is a wasteful number, since it uses less digits than its factorization.

81659370321852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62038898 (or 62038896 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 60.

The spelling of 81659370321852 in words is "eighty-one trillion, six hundred fifty-nine billion, three hundred seventy million, three hundred twenty-one thousand, eight hundred fifty-two".