63555867648 has 352 divisors, whose sum is σ = 231666686720. Its totient is φ = 16761323520.

The previous prime is 63555867643. The next prime is 63555867653. The reversal of 63555867648 is 84676855536.

63555867648 is a `hidden beast` number, since 6 + 3 + 5 + 5 + 586 + 7 + 6 + 48 = 666.

It is an interprime number because it is at equal distance from previous prime (63555867643) and next prime (63555867653).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63555867643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2503338 + ... + 2528598.

Almost surely, 2^63555867648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63555867648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115833343360).

63555867648 is an abundant number, since it is smaller than the sum of its proper divisors (168110819072).

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

63555867648 is a wasteful number, since it uses less digits than its factorization.

63555867648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25310 (or 25286 counting only the distinct ones).

The product of its digits is 145152000, while the sum is 63.

The spelling of 63555867648 in words is "sixty-three billion, five hundred fifty-five million, eight hundred sixty-seven thousand, six hundred forty-eight".