63813863081 has 4 divisors (see below), whose sum is σ = 63940730112. Its totient is φ = 63686996052.

The previous prime is 63813863063. The next prime is 63813863093. The reversal of 63813863081 is 18036831836.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63813863081 - 2²² = 63809668777 is a prime.

It is a super-2 number, since 2×63813863081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63813863681) 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, 63432761 + ... + 63433766.

It is an arithmetic number, because the mean of its divisors is an integer number (15985182528).

Almost surely, 2^63813863081 is an apocalyptic number.

It is an amenable number.

63813863081 is a deficient number, since it is larger than the sum of its proper divisors (126867031).

63813863081 is a wasteful number, since it uses less digits than its factorization.

63813863081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126867030.

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 63813863081 in words is "sixty-three billion, eight hundred thirteen million, eight hundred sixty-three thousand, eighty-one".