63313861521 has 4 divisors (see below), whose sum is σ = 84418482032. Its totient is φ = 42209241012.

The previous prime is 63313861517. The next prime is 63313861543. The reversal of 63313861521 is 12516831336.

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 not a de Polignac number, because 63313861521 - 2² = 63313861517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63313861521.

It is not an unprimeable number, because it can be changed into a prime (63313861511) 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, 10552310251 + ... + 10552310256.

It is an arithmetic number, because the mean of its divisors is an integer number (21104620508).

Almost surely, 2^63313861521 is an apocalyptic number.

It is an amenable number.

63313861521 is a deficient number, since it is larger than the sum of its proper divisors (21104620511).

63313861521 is a wasteful number, since it uses less digits than its factorization.

63313861521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21104620510.

The product of its digits is 77760, while the sum is 39.

The spelling of 63313861521 in words is "sixty-three billion, three hundred thirteen million, eight hundred sixty-one thousand, five hundred twenty-one".