63511297920 has 768 divisors, whose sum is σ = 257443430400. Its totient is φ = 14129676288.

The previous prime is 63511297909. The next prime is 63511297939. The reversal of 63511297920 is 2979211536.

It is a happy number.

63511297920 is a `hidden beast` number, since 6 + 351 + 1 + 297 + 9 + 2 + 0 = 666.

63511297920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 404530482 + ... + 404530638.

It is an arithmetic number, because the mean of its divisors is an integer number (335212800).

Almost surely, 2^63511297920 is an apocalyptic number.

63511297920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63511297920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128721715200).

63511297920 is an abundant number, since it is smaller than the sum of its proper divisors (193932132480).

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

63511297920 is a wasteful number, since it uses less digits than its factorization.

63511297920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 63511297920 in words is "sixty-three billion, five hundred eleven million, two hundred ninety-seven thousand, nine hundred twenty".