63618220521 has 12 divisors (see below), whose sum is σ = 91897790400. Its totient is φ = 42409929240.

The previous prime is 63618220517. The next prime is 63618220531. The reversal of 63618220521 is 12502281636.

63618220521 is a `hidden beast` number, since 6 + 36 + 1 + 82 + 20 + 521 = 666.

It is not a de Polignac number, because 63618220521 - 2² = 63618220517 is a prime.

It is a super-2 number, since 2×63618220521² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63618220531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7380 + ... + 356778.

It is an arithmetic number, because the mean of its divisors is an integer number (7658149200).

Almost surely, 2^63618220521 is an apocalyptic number.

It is an amenable number.

63618220521 is a deficient number, since it is larger than the sum of its proper divisors (28279569879).

63618220521 is a wasteful number, since it uses less digits than its factorization.

63618220521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369636 (or 369633 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 63618220521 in words is "sixty-three billion, six hundred eighteen million, two hundred twenty thousand, five hundred twenty-one".