63665856636 has 96 divisors (see below), whose sum is σ = 153879118848. Its totient is φ = 20471742720.

The previous prime is 63665856623. The next prime is 63665856649.

63665856636 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (63665856623) and next prime (63665856649).

It is a self number, because there is not a number n which added to its sum of digits gives 63665856636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34026781 + ... + 34028651.

It is an arithmetic number, because the mean of its divisors is an integer number (1602907488).

Almost surely, 2^63665856636 is an apocalyptic number.

It is an amenable number.

63665856636 is an abundant number, since it is smaller than the sum of its proper divisors (90213262212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63665856636 is a wasteful number, since it uses less digits than its factorization.

63665856636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531 (or 2529 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 60.

The spelling of 63665856636 in words is "sixty-three billion, six hundred sixty-five million, eight hundred fifty-six thousand, six hundred thirty-six".