66776172 has 24 divisors (see below), whose sum is σ = 157785600. Its totient is φ = 21976656.

The previous prime is 66776159. The next prime is 66776179. The reversal of 66776172 is 27167766.

It is not an unprimeable number, because it can be changed into a prime (66776179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34272 + ... + 36167.

It is an arithmetic number, because the mean of its divisors is an integer number (6574400).

Almost surely, 2^66776172 is an apocalyptic number.

It is an amenable number.

66776172 is an abundant number, since it is smaller than the sum of its proper divisors (91009428).

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

66776172 is a wasteful number, since it uses less digits than its factorization.

66776172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70525 (or 70523 counting only the distinct ones).

The product of its digits is 148176, while the sum is 42.

The square root of 66776172 is about 8171.6688626008. The cubic root of 66776172 is about 405.7020227776.

The spelling of 66776172 in words is "sixty-six million, seven hundred seventy-six thousand, one hundred seventy-two".