65439122172 has 24 divisors (see below), whose sum is σ = 154970261376. Its totient is φ = 21487472688.

The previous prime is 65439122153. The next prime is 65439122249. The reversal of 65439122172 is 27122193456.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40695168 + ... + 40696775.

It is an arithmetic number, because the mean of its divisors is an integer number (6457094224).

Almost surely, 2^65439122172 is an apocalyptic number.

It is an amenable number.

65439122172 is an abundant number, since it is smaller than the sum of its proper divisors (89531139204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65439122172 is a wasteful number, since it uses less digits than its factorization.

65439122172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81392017 (or 81392015 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The spelling of 65439122172 in words is "sixty-five billion, four hundred thirty-nine million, one hundred twenty-two thousand, one hundred seventy-two".