63987155115520 has 1920 divisors, whose sum is σ = 210254292864000. Its totient is φ = 18505695559680.

The previous prime is 63987155115511. The next prime is 63987155115547. The reversal of 63987155115520 is 2551155178936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 208427215207 + ... + 208427215513.

It is an arithmetic number, because the mean of its divisors is an integer number (109507444200).

Almost surely, 2^{63987155115520} 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 63987155115520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105127146432000).

63987155115520 is an abundant number, since it is smaller than the sum of its proper divisors (146267137748480).

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

63987155115520 is a wasteful number, since it uses less digits than its factorization.

63987155115520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 11340000, while the sum is 58.

The spelling of 63987155115520 in words is "sixty-three trillion, nine hundred eighty-seven billion, one hundred fifty-five million, one hundred fifteen thousand, five hundred twenty".