63636213364621 has 4 divisors (see below), whose sum is σ = 63636257460544. Its totient is φ = 63636169268700.

The previous prime is 63636213364613. The next prime is 63636213364639. The reversal of 63636213364621 is 12646331263636.

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 63636213364621 - 2³ = 63636213364613 is a prime.

It is a super-3 number, since 3×63636213364621³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63636213364601) 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, 19807365 + ... + 22794826.

It is an arithmetic number, because the mean of its divisors is an integer number (15909064365136).

Almost surely, 2^{63636213364621} is an apocalyptic number.

It is an amenable number.

63636213364621 is a deficient number, since it is larger than the sum of its proper divisors (44095923).

63636213364621 is a wasteful number, since it uses less digits than its factorization.

63636213364621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44095922.

The product of its digits is 10077696, while the sum is 52.

The spelling of 63636213364621 in words is "sixty-three trillion, six hundred thirty-six billion, two hundred thirteen million, three hundred sixty-four thousand, six hundred twenty-one".