63957677661 has 24 divisors (see below), whose sum is σ = 97833550464. Its totient is φ = 40123774080.

The previous prime is 63957677653. The next prime is 63957677713. The reversal of 63957677661 is 16677675936.

It is not a de Polignac number, because 63957677661 - 2³ = 63957677653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63953677661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1013916 + ... + 1075146.

It is an arithmetic number, because the mean of its divisors is an integer number (4076397936).

Almost surely, 2^63957677661 is an apocalyptic number.

It is an amenable number.

63957677661 is a deficient number, since it is larger than the sum of its proper divisors (33875872803).

63957677661 is a wasteful number, since it uses less digits than its factorization.

63957677661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68081 (or 68078 counting only the distinct ones).

The product of its digits is 60011280, while the sum is 63.

The spelling of 63957677661 in words is "sixty-three billion, nine hundred fifty-seven million, six hundred seventy-seven thousand, six hundred sixty-one".