85439772961 has 16 divisors (see below), whose sum is σ = 89323067520. Its totient is φ = 81651715200.

The previous prime is 85439772937. The next prime is 85439773019. The reversal of 85439772961 is 16927793458.

It is a cyclic number.

It is not a de Polignac number, because 85439772961 - 2¹⁵ = 85439740193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85439772961.

It is not an unprimeable number, because it can be changed into a prime (85439772661) 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, 411330 + ... + 583156.

It is an arithmetic number, because the mean of its divisors is an integer number (5582691720).

Almost surely, 2^85439772961 is an apocalyptic number.

It is an amenable number.

85439772961 is a deficient number, since it is larger than the sum of its proper divisors (3883294559).

85439772961 is a wasteful number, since it uses less digits than its factorization.

85439772961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172104.

The product of its digits is 22861440, while the sum is 61.

The spelling of 85439772961 in words is "eighty-five billion, four hundred thirty-nine million, seven hundred seventy-two thousand, nine hundred sixty-one".