51521505552 has 60 divisors (see below), whose sum is σ = 157296722544. Its totient is φ = 15612576960.

The previous prime is 51521505547. The next prime is 51521505613. The reversal of 51521505552 is 25550512515.

51521505552 is a `hidden beast` number, since 5 + 1 + 52 + 1 + 50 + 5 + 552 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16261518 + ... + 16264685.

Almost surely, 2^51521505552 is an apocalyptic number.

It is an amenable number.

51521505552 is an abundant number, since it is smaller than the sum of its proper divisors (105775216992).

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

51521505552 is a wasteful number, since it uses less digits than its factorization.

51521505552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32526228 (or 32526219 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 36.

The spelling of 51521505552 in words is "fifty-one billion, five hundred twenty-one million, five hundred five thousand, five hundred fifty-two".