81651605202 has 16 divisors (see below), whose sum is σ = 181448011680. Its totient is φ = 27217201716.

The previous prime is 81651605171. The next prime is 81651605213. The reversal of 81651605202 is 20250615618.

81651605202 is a `hidden beast` number, since 81 + 6 + 51 + 6 + 0 + 520 + 2 = 666.

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, 756033328 + ... + 756033435.

It is an arithmetic number, because the mean of its divisors is an integer number (11340500730).

Almost surely, 2^81651605202 is an apocalyptic number.

81651605202 is an abundant number, since it is smaller than the sum of its proper divisors (99796406478).

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

81651605202 is a wasteful number, since it uses less digits than its factorization.

81651605202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512066774 (or 1512066768 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 81651605202 in words is "eighty-one billion, six hundred fifty-one million, six hundred five thousand, two hundred two".