85188139205 has 16 divisors (see below), whose sum is σ = 110119201920. Its totient is φ = 62891070528.

The previous prime is 85188139199. The next prime is 85188139219. The reversal of 85188139205 is 50293188158.

It is a happy number.

It is not a de Polignac number, because 85188139205 - 2²⁶ = 85121030341 is a prime.

It is a super-2 number, since 2×85188139205² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65534 + ... + 417936.

It is an arithmetic number, because the mean of its divisors is an integer number (6882450120).

Almost surely, 2^85188139205 is an apocalyptic number.

It is an amenable number.

85188139205 is a deficient number, since it is larger than the sum of its proper divisors (24931062715).

85188139205 is a wasteful number, since it uses less digits than its factorization.

85188139205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356140.

The product of its (nonzero) digits is 691200, while the sum is 50.

The spelling of 85188139205 in words is "eighty-five billion, one hundred eighty-eight million, one hundred thirty-nine thousand, two hundred five".