63991620000 has 1920 divisors, whose sum is σ = 309860812800. Its totient is φ = 12597120000.

The previous prime is 63991619983. The next prime is 63991620001. The reversal of 63991620000 is 2619936.

63991620000 is a `hidden beast` number, since 639 + 9 + 16 + 2 + 0 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (63991620001) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 3367979991 + ... + 3367980009.

It is an arithmetic number, because the mean of its divisors is an integer number (161385840).

Almost surely, 2^63991620000 is an apocalyptic number.

63991620000 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 63991620000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154930406400).

63991620000 is an abundant number, since it is smaller than the sum of its proper divisors (245869192800).

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

63991620000 is an equidigital number, since it uses as much as digits as its factorization.

63991620000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The spelling of 63991620000 in words is "sixty-three billion, nine hundred ninety-one million, six hundred twenty thousand".