63516465621 has 24 divisors (see below), whose sum is σ = 107686435584. Its totient is φ = 35314172640.

The previous prime is 63516465619. The next prime is 63516465643. The reversal of 63516465621 is 12656461536.

63516465621 is a `hidden beast` number, since 6 + 3 + 5 + 16 + 4 + 6 + 5 + 621 = 666.

It is not a de Polignac number, because 63516465621 - 2¹ = 63516465619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63516465821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13621965 + ... + 13626626.

It is an arithmetic number, because the mean of its divisors is an integer number (4486934816).

Almost surely, 2^63516465621 is an apocalyptic number.

It is an amenable number.

63516465621 is a deficient number, since it is larger than the sum of its proper divisors (44169969963).

63516465621 is a wasteful number, since it uses less digits than its factorization.

63516465621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27248641 (or 27248638 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 63516465621 in words is "sixty-three billion, five hundred sixteen million, four hundred sixty-five thousand, six hundred twenty-one".