63521880320 has 72 divisors (see below), whose sum is σ = 153265795704. Its totient is φ = 25223217152.

The previous prime is 63521880299. The next prime is 63521880353. The reversal of 63521880320 is 2308812536.

It can be written as a sum of positive squares in 4 ways, for example, as 12163442944 + 51358437376 = 110288^2 + 226624^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5759 + ... + 356478.

It is an arithmetic number, because the mean of its divisors is an integer number (2128691607).

Almost surely, 2^63521880320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63521880320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76632897852).

63521880320 is an abundant number, since it is smaller than the sum of its proper divisors (89743915384).

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

63521880320 is a wasteful number, since it uses less digits than its factorization.

63521880320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362395 (or 362381 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 63521880320 in words is "sixty-three billion, five hundred twenty-one million, eight hundred eighty thousand, three hundred twenty".