66520706712 has 32 divisors (see below), whose sum is σ = 167916353280. Its totient is φ = 21958290720.

The previous prime is 66520706689. The next prime is 66520706741. The reversal of 66520706712 is 21760702566.

It is a congruent number.

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, 13452364 + ... + 13457307.

It is an arithmetic number, because the mean of its divisors is an integer number (5247386040).

Almost surely, 2^66520706712 is an apocalyptic number.

It is an amenable number.

66520706712 is an abundant number, since it is smaller than the sum of its proper divisors (101395646568).

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

66520706712 is a wasteful number, since it uses less digits than its factorization.

66520706712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26909783 (or 26909779 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 66520706712 in words is "sixty-six billion, five hundred twenty million, seven hundred six thousand, seven hundred twelve".