63956977920 has 1152 divisors, whose sum is σ = 262594805760. Its totient is φ = 14780620800.

The previous prime is 63956977919. The next prime is 63956977937. The reversal of 63956977920 is 2977965936.

63956977920 is a `hidden beast` number, since 63 + 9 + 569 + 7 + 7 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 954581727 + ... + 954581793.

It is an arithmetic number, because the mean of its divisors is an integer number (227946880).

Almost surely, 2^63956977920 is an apocalyptic number.

63956977920 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 63956977920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131297402880).

63956977920 is an abundant number, since it is smaller than the sum of its proper divisors (198637827840).

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

63956977920 is an equidigital number, since it uses as much as digits as its factorization.

63956977920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 38578680, while the sum is 63.

The spelling of 63956977920 in words is "sixty-three billion, nine hundred fifty-six million, nine hundred seventy-seven thousand, nine hundred twenty".