81745518670 has 32 divisors (see below), whose sum is σ = 150951918816. Its totient is φ = 31861564800.

The previous prime is 81745518667. The next prime is 81745518713. The reversal of 81745518670 is 7681554718.

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, 560941 + ... + 691480.

It is an arithmetic number, because the mean of its divisors is an integer number (4717247463).

Almost surely, 2^81745518670 is an apocalyptic number.

81745518670 is a deficient number, since it is larger than the sum of its proper divisors (69206400146).

81745518670 is a wasteful number, since it uses less digits than its factorization.

81745518670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252596.

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 81745518670 in words is "eighty-one billion, seven hundred forty-five million, five hundred eighteen thousand, six hundred seventy".