81589645960 has 32 divisors (see below), whose sum is σ = 183725942400. Its totient is φ = 32609327040.

The previous prime is 81589645913. The next prime is 81589645981. The reversal of 81589645960 is 6954698518.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

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, 779250 + ... + 877729.

It is an arithmetic number, because the mean of its divisors is an integer number (5741435700).

Almost surely, 2^81589645960 is an apocalyptic number.

It is an amenable number.

81589645960 is an abundant number, since it is smaller than the sum of its proper divisors (102136296440).

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

81589645960 is a wasteful number, since it uses less digits than its factorization.

81589645960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658221 (or 1658217 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 61.

The spelling of 81589645960 in words is "eighty-one billion, five hundred eighty-nine million, six hundred forty-five thousand, nine hundred sixty".