66156672 has 32 divisors (see below), whose sum is σ = 175729680. Its totient is φ = 22052096.

The previous prime is 66156659. The next prime is 66156677. The reversal of 66156672 is 27665166.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 66156672.

It is not an unprimeable number, because it can be changed into a prime (66156677) 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, 85758 + ... + 86525.

Almost surely, 2^66156672 is an apocalyptic number.

It is an amenable number.

66156672 is an abundant number, since it is smaller than the sum of its proper divisors (109573008).

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

66156672 is a wasteful number, since it uses less digits than its factorization.

66156672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172300 (or 172288 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 66156672 is about 8133.6751840727. The cubic root of 66156672 is about 404.4435216695.

The spelling of 66156672 in words is "sixty-six million, one hundred fifty-six thousand, six hundred seventy-two".