66357012672 has 112 divisors (see below), whose sum is σ = 196168060800. Its totient is φ = 21995331840.

The previous prime is 66357012653. The next prime is 66357012677. The reversal of 66357012672 is 27621075366.

66357012672 is a `hidden beast` number, since 6 + 6 + 3 + 570 + 1 + 2 + 6 + 72 = 666.

It is not an unprimeable number, because it can be changed into a prime (66357012677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202047 + ... + 416577.

Almost surely, 2^66357012672 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 66357012672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98084030400).

66357012672 is an abundant number, since it is smaller than the sum of its proper divisors (129811048128).

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

66357012672 is a wasteful number, since it uses less digits than its factorization.

66357012672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214731 (or 214715 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 66357012672 in words is "sixty-six billion, three hundred fifty-seven million, twelve thousand, six hundred seventy-two".