63645373136 has 10 divisors (see below), whose sum is σ = 123312910482. Its totient is φ = 31822686560.

The previous prime is 63645373117. The next prime is 63645373213. The reversal of 63645373136 is 63137354636.

63645373136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 56474670736 + 7170702400 = 237644^2 + 84680^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1988917895 + ... + 1988917926.

Almost surely, 2^63645373136 is an apocalyptic number.

It is an amenable number.

63645373136 is a deficient number, since it is larger than the sum of its proper divisors (59667537346).

63645373136 is a wasteful number, since it uses less digits than its factorization.

63645373136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977835829 (or 3977835823 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 47.

The spelling of 63645373136 in words is "sixty-three billion, six hundred forty-five million, three hundred seventy-three thousand, one hundred thirty-six".