86172521990 has 16 divisors (see below), whose sum is σ = 155515534848. Its totient is φ = 34379009856.

The previous prime is 86172521971. The next prime is 86172522041. The reversal of 86172521990 is 9912527168.

It is a super-2 number, since 2×86172521990² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11245847 + ... + 11253506.

It is an arithmetic number, because the mean of its divisors is an integer number (9719720928).

Almost surely, 2^86172521990 is an apocalyptic number.

86172521990 is a deficient number, since it is larger than the sum of its proper divisors (69343012858).

86172521990 is a wasteful number, since it uses less digits than its factorization.

86172521990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22499743.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 86172521990 in words is "eighty-six billion, one hundred seventy-two million, five hundred twenty-one thousand, nine hundred ninety".