66555760572 has 108 divisors (see below), whose sum is σ = 197501664360. Its totient is φ = 18841419072.

The previous prime is 66555760559. The next prime is 66555760591. The reversal of 66555760572 is 27506755566.

It is a happy number.

66555760572 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 5 + 7 + 60 + 572 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19203 + ... + 365349.

Almost surely, 2^66555760572 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 66555760572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98750832180).

66555760572 is an abundant number, since it is smaller than the sum of its proper divisors (130945903788).

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

66555760572 is a wasteful number, since it uses less digits than its factorization.

66555760572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346280 (or 346268 counting only the distinct ones).

The product of its (nonzero) digits is 13230000, while the sum is 54.

The spelling of 66555760572 in words is "sixty-six billion, five hundred fifty-five million, seven hundred sixty thousand, five hundred seventy-two".