75216129172 has 18 divisors (see below), whose sum is σ = 135281904702. Its totient is φ = 36591627744.

The previous prime is 75216129169. The next prime is 75216129187. The reversal of 75216129172 is 27192161257.

It can be written as a sum of positive squares in 3 ways, for example, as 19484251396 + 55731877776 = 139586^2 + 236076^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6862323 + ... + 6873274.

Almost surely, 2^75216129172 is an apocalyptic number.

It is an amenable number.

75216129172 is a deficient number, since it is larger than the sum of its proper divisors (60065775530).

75216129172 is a wasteful number, since it uses less digits than its factorization.

75216129172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13735675 (or 13735636 counting only the distinct ones).

The product of its digits is 105840, while the sum is 43.

The spelling of 75216129172 in words is "seventy-five billion, two hundred sixteen million, one hundred twenty-nine thousand, one hundred seventy-two".