85642605655 has 4 divisors (see below), whose sum is σ = 102771126792. Its totient is φ = 68514084520.

The previous prime is 85642605647. The next prime is 85642605689. The reversal of 85642605655 is 55650624658.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 85642605655 - 2³ = 85642605647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8564260561 + ... + 8564260570.

It is an arithmetic number, because the mean of its divisors is an integer number (25692781698).

Almost surely, 2^85642605655 is an apocalyptic number.

85642605655 is a deficient number, since it is larger than the sum of its proper divisors (17128521137).

85642605655 is a wasteful number, since it uses less digits than its factorization.

85642605655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17128521136.

The product of its (nonzero) digits is 8640000, while the sum is 52.

The spelling of 85642605655 in words is "eighty-five billion, six hundred forty-two million, six hundred five thousand, six hundred fifty-five".