63661372464 has 20 divisors (see below), whose sum is σ = 164458545656. Its totient is φ = 21220457472.

The previous prime is 63661372451. The next prime is 63661372471. The reversal of 63661372464 is 46427316636.

It is a super-4 number, since 4×63661372464⁴ (a number of 44 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1326278593 = 63661372464 / (6 + 3 + 6 + 6 + 1 + 3 + 7 + 2 + 4 + 6 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663139249 + ... + 663139344.

Almost surely, 2^63661372464 is an apocalyptic number.

It is an amenable number.

63661372464 is an abundant number, since it is smaller than the sum of its proper divisors (100797173192).

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

63661372464 is a wasteful number, since it uses less digits than its factorization.

63661372464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326278604 (or 1326278598 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 48.

The spelling of 63661372464 in words is "sixty-three billion, six hundred sixty-one million, three hundred seventy-two thousand, four hundred sixty-four".