63475757988 has 12 divisors (see below), whose sum is σ = 148110102000. Its totient is φ = 21158585992.

The previous prime is 63475757959. The next prime is 63475757993. The reversal of 63475757988 is 88975757436.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×63475757988² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2644823238 + ... + 2644823261.

It is an arithmetic number, because the mean of its divisors is an integer number (12342508500).

Almost surely, 2^63475757988 is an apocalyptic number.

It is an amenable number.

63475757988 is an abundant number, since it is smaller than the sum of its proper divisors (84634344012).

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

63475757988 is a wasteful number, since it uses less digits than its factorization.

63475757988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5289646506 (or 5289646504 counting only the distinct ones).

The product of its digits is 355622400, while the sum is 69.

The spelling of 63475757988 in words is "sixty-three billion, four hundred seventy-five million, seven hundred fifty-seven thousand, nine hundred eighty-eight".