63951722640 has 600 divisors, whose sum is σ = 251069734080. Its totient is φ = 15051598848.

The previous prime is 63951722623. The next prime is 63951722647. The reversal of 63951722640 is 4622715936.

63951722640 is a `hidden beast` number, since 639 + 5 + 1 + 7 + 2 + 2 + 6 + 4 + 0 = 666.

63951722640 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 not an unprimeable number, because it can be changed into a prime (63951722647) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 25186491 + ... + 25189029.

Almost surely, 2^63951722640 is an apocalyptic number.

63951722640 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 63951722640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125534867040).

63951722640 is an abundant number, since it is smaller than the sum of its proper divisors (187118011440).

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

63951722640 is a wasteful number, since it uses less digits than its factorization.

63951722640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613 (or 2585 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 63951722640 in words is "sixty-three billion, nine hundred fifty-one million, seven hundred twenty-two thousand, six hundred forty".