66201572072 has 16 divisors (see below), whose sum is σ = 125075491200. Its totient is φ = 32848107760.

The previous prime is 66201572051. The next prime is 66201572077. The reversal of 66201572072 is 27027510266.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66201572077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31583672 + ... + 31585767.

It is an arithmetic number, because the mean of its divisors is an integer number (7817218200).

Almost surely, 2^66201572072 is an apocalyptic number.

It is an amenable number.

66201572072 is a deficient number, since it is larger than the sum of its proper divisors (58873919128).

66201572072 is a wasteful number, since it uses less digits than its factorization.

66201572072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63169576 (or 63169572 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The spelling of 66201572072 in words is "sixty-six billion, two hundred one million, five hundred seventy-two thousand, seventy-two".