63855381732 has 12 divisors (see below), whose sum is σ = 148995890736. Its totient is φ = 21285127240.

The previous prime is 63855381679. The next prime is 63855381739. The reversal of 63855381732 is 23718355836.

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

It is a super-2 number, since 2×63855381732² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63855381739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2660640894 + ... + 2660640917.

It is an arithmetic number, because the mean of its divisors is an integer number (12416324228).

Almost surely, 2^63855381732 is an apocalyptic number.

It is an amenable number.

63855381732 is an abundant number, since it is smaller than the sum of its proper divisors (85140509004).

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

63855381732 is a wasteful number, since it uses less digits than its factorization.

63855381732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5321281818 (or 5321281816 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 51.

The spelling of 63855381732 in words is "sixty-three billion, eight hundred fifty-five million, three hundred eighty-one thousand, seven hundred thirty-two".