85297570639 has 16 divisors (see below), whose sum is σ = 88462540800. Its totient is φ = 82181754144.

The previous prime is 85297570627. The next prime is 85297570643. The reversal of 85297570639 is 93607579258.

It is a cyclic number.

It is not a de Polignac number, because 85297570639 - 2¹¹ = 85297568591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85297570609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1555954 + ... + 1609840.

It is an arithmetic number, because the mean of its divisors is an integer number (5528908800).

Almost surely, 2^85297570639 is an apocalyptic number.

85297570639 is a deficient number, since it is larger than the sum of its proper divisors (3164970161).

85297570639 is a wasteful number, since it uses less digits than its factorization.

85297570639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54342.

The product of its (nonzero) digits is 28576800, while the sum is 61.

The spelling of 85297570639 in words is "eighty-five billion, two hundred ninety-seven million, five hundred seventy thousand, six hundred thirty-nine".