65139197472 has 72 divisors (see below), whose sum is σ = 185409966924. Its totient is φ = 21693095424.

The previous prime is 65139197441. The next prime is 65139197477. The reversal of 65139197472 is 27479193156.

65139197472 is a `hidden beast` number, since 6 + 51 + 39 + 1 + 97 + 472 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63667400976 + 1471796496 = 252324^2 + 38364^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×65139197472² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65139197477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211318 + ... + 418250.

Almost surely, 2^65139197472 is an apocalyptic number.

It is an amenable number.

65139197472 is an abundant number, since it is smaller than the sum of its proper divisors (120270769452).

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

65139197472 is a wasteful number, since it uses less digits than its factorization.

65139197472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208042 (or 208031 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The spelling of 65139197472 in words is "sixty-five billion, one hundred thirty-nine million, one hundred ninety-seven thousand, four hundred seventy-two".