66521424750 has 64 divisors (see below), whose sum is σ = 181131814656. Its totient is φ = 16126404000.

The previous prime is 66521424733. The next prime is 66521424773. The reversal of 66521424750 is 5742412566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4023352 + ... + 4039851.

It is an arithmetic number, because the mean of its divisors is an integer number (2830184604).

Almost surely, 2^66521424750 is an apocalyptic number.

66521424750 is an abundant number, since it is smaller than the sum of its proper divisors (114610389906).

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

66521424750 is a wasteful number, since it uses less digits than its factorization.

66521424750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8063234 (or 8063224 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 66521424750 in words is "sixty-six billion, five hundred twenty-one million, four hundred twenty-four thousand, seven hundred fifty".