63964451520 has 448 divisors, whose sum is σ = 243971673600. Its totient is φ = 15721205760.

The previous prime is 63964451513. The next prime is 63964451531. The reversal of 63964451520 is 2515446936.

63964451520 is a `hidden beast` number, since 6 + 3 + 96 + 44 + 515 + 2 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6068655 + ... + 6079185.

Almost surely, 2^63964451520 is an apocalyptic number.

63964451520 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 63964451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121985836800).

63964451520 is an abundant number, since it is smaller than the sum of its proper divisors (180007222080).

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

63964451520 is a wasteful number, since it uses less digits than its factorization.

63964451520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10613 (or 10597 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 63964451520 in words is "sixty-three billion, nine hundred sixty-four million, four hundred fifty-one thousand, five hundred twenty".