63172729768 has 32 divisors (see below), whose sum is σ = 122833089000. Its totient is φ = 30422568960.

The previous prime is 63172729727. The next prime is 63172729771. The reversal of 63172729768 is 86792727136.

It can be written as a sum of positive squares in 4 ways, for example, as 61425656964 + 1747072804 = 247842^2 + 41798^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

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, 237993 + ... + 427768.

Almost surely, 2^63172729768 is an apocalyptic number.

It is an amenable number.

63172729768 is a deficient number, since it is larger than the sum of its proper divisors (59660359232).

63172729768 is a wasteful number, since it uses less digits than its factorization.

63172729768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666205 (or 666201 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 58.

The spelling of 63172729768 in words is "sixty-three billion, one hundred seventy-two million, seven hundred twenty-nine thousand, seven hundred sixty-eight".