63331621557 has 4 divisors (see below), whose sum is σ = 84442162080. Its totient is φ = 42221081036.

The previous prime is 63331621531. The next prime is 63331621567. The reversal of 63331621557 is 75512613336.

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 63331621557 - 2¹⁰ = 63331620533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63331621567) 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, 10555270257 + ... + 10555270262.

It is an arithmetic number, because the mean of its divisors is an integer number (21110540520).

Almost surely, 2^63331621557 is an apocalyptic number.

It is an amenable number.

63331621557 is a deficient number, since it is larger than the sum of its proper divisors (21110540523).

63331621557 is a wasteful number, since it uses less digits than its factorization.

63331621557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21110540522.

The product of its digits is 340200, while the sum is 42.

The spelling of 63331621557 in words is "sixty-three billion, three hundred thirty-one million, six hundred twenty-one thousand, five hundred fifty-seven".