85172355739 has 4 divisors (see below), whose sum is σ = 85194957640. Its totient is φ = 85149753840.

The previous prime is 85172355721. The next prime is 85172355841. The reversal of 85172355739 is 93755327158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93755327158 = 2 ⋅46877663579.

It is a cyclic number.

It is not a de Polignac number, because 85172355739 - 2¹¹ = 85172353691 is a prime.

It is a super-2 number, since 2×85172355739² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85172355739.

It is not an unprimeable number, because it can be changed into a prime (85172355139) 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, 11295297 + ... + 11302834.

It is an arithmetic number, because the mean of its divisors is an integer number (21298739410).

Almost surely, 2^85172355739 is an apocalyptic number.

85172355739 is a deficient number, since it is larger than the sum of its proper divisors (22601901).

85172355739 is a wasteful number, since it uses less digits than its factorization.

85172355739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22601900.

The product of its digits is 7938000, while the sum is 55.

The spelling of 85172355739 in words is "eighty-five billion, one hundred seventy-two million, three hundred fifty-five thousand, seven hundred thirty-nine".