438656561808 has 20 divisors (see below), whose sum is σ = 1133196118128. Its totient is φ = 146218853920.

The previous prime is 438656561807. The next prime is 438656561887. The reversal of 438656561808 is 808165656834.

It is a happy number.

438656561808 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×438656561808³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (438656561807) 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, 4569339138 + ... + 4569339233.

Almost surely, 2^438656561808 is an apocalyptic number.

438656561808 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

438656561808 is an abundant number, since it is smaller than the sum of its proper divisors (694539556320).

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

438656561808 is a wasteful number, since it uses less digits than its factorization.

438656561808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9138678382 (or 9138678376 counting only the distinct ones).

The product of its (nonzero) digits is 33177600, while the sum is 60.

The spelling of 438656561808 in words is "four hundred thirty-eight billion, six hundred fifty-six million, five hundred sixty-one thousand, eight hundred eight".