63642121364 has 24 divisors (see below), whose sum is σ = 111658701000. Its totient is φ = 31739690880.

The previous prime is 63642121339. The next prime is 63642121369. The reversal of 63642121364 is 46312124636.

It can be written as a sum of positive squares in 4 ways, for example, as 233845264 + 63408276100 = 15292^2 + 251810^2 .

It is a super-2 number, since 2×63642121364² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63642121369) 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 7 ways as a sum of consecutive naturals, for example, 6391862 + ... + 6401810.

It is an arithmetic number, because the mean of its divisors is an integer number (4652445875).

Almost surely, 2^63642121364 is an apocalyptic number.

It is an amenable number.

63642121364 is a deficient number, since it is larger than the sum of its proper divisors (48016579636).

63642121364 is a wasteful number, since it uses less digits than its factorization.

63642121364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13883 (or 13881 counting only the distinct ones).

The product of its digits is 124416, while the sum is 38.

The spelling of 63642121364 in words is "sixty-three billion, six hundred forty-two million, one hundred twenty-one thousand, three hundred sixty-four".