63855988566 has 16 divisors (see below), whose sum is σ = 127714719600. Its totient is φ = 21284872448.

The previous prime is 63855988561. The next prime is 63855988597. The reversal of 63855988566 is 66588955836.

It is a super-2 number, since 2×63855988566² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63855988566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63855988561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309070 + ... + 472478.

It is an arithmetic number, because the mean of its divisors is an integer number (7982169975).

Almost surely, 2^63855988566 is an apocalyptic number.

63855988566 is an abundant number, since it is smaller than the sum of its proper divisors (63858731034).

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

63855988566 is a wasteful number, since it uses less digits than its factorization.

63855988566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228543.

The product of its digits is 373248000, while the sum is 69.

The spelling of 63855988566 in words is "sixty-three billion, eight hundred fifty-five million, nine hundred eighty-eight thousand, five hundred sixty-six".