85991699619957 has 4 divisors (see below), whose sum is σ = 114655599493280. Its totient is φ = 57327799746636.

The previous prime is 85991699619941. The next prime is 85991699620003. The reversal of 85991699619957 is 75991699619958.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85991699619957 - 2⁴ = 85991699619941 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 (85991699619757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14331949936657 + ... + 14331949936662.

It is an arithmetic number, because the mean of its divisors is an integer number (28663899873320).

Almost surely, 2^{85991699619957} is an apocalyptic number.

It is an amenable number.

85991699619957 is a deficient number, since it is larger than the sum of its proper divisors (28663899873323).

85991699619957 is a wasteful number, since it uses less digits than its factorization.

85991699619957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28663899873322.

The product of its digits is 26784626400, while the sum is 93.

Subtracting from 85991699619957 its reverse (75991699619958), we obtain a palindrome (9999999999999).

The spelling of 85991699619957 in words is "eighty-five trillion, nine hundred ninety-one billion, six hundred ninety-nine million, six hundred nineteen thousand, nine hundred fifty-seven".