66117772 has 12 divisors (see below), whose sum is σ = 132235600. Its totient is φ = 28336176.

The previous prime is 66117763. The next prime is 66117773. The reversal of 66117772 is 27771166.

66117772 is an admirable number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66117773) 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, 1180647 + ... + 1180702.

Almost surely, 2^66117772 is an apocalyptic number.

It is an amenable number.

66117772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66117772 is a wasteful number, since it uses less digits than its factorization.

66117772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361360 (or 2361358 counting only the distinct ones).

The product of its digits is 24696, while the sum is 37.

The square root of 66117772 is about 8131.2835395158. The cubic root of 66117772 is about 404.3642354481.

The spelling of 66117772 in words is "sixty-six million, one hundred seventeen thousand, seven hundred seventy-two".