66777117 has 12 divisors (see below), whose sum is σ = 97866720. Its totient is φ = 40470760.

The previous prime is 66777107. The next prime is 66777167. The reversal of 66777117 is 71177766.

It is not a de Polignac number, because 66777117 - 2²² = 62582813 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66777107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91617 + ... + 92342.

It is an arithmetic number, because the mean of its divisors is an integer number (8155560).

Almost surely, 2^66777117 is an apocalyptic number.

It is an amenable number.

66777117 is a deficient number, since it is larger than the sum of its proper divisors (31089603).

66777117 is a wasteful number, since it uses less digits than its factorization.

66777117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183984 (or 183973 counting only the distinct ones).

The product of its digits is 86436, while the sum is 42.

The square root of 66777117 is about 8171.7266841225. The cubic root of 66777117 is about 405.7039365671.

The spelling of 66777117 in words is "sixty-six million, seven hundred seventy-seven thousand, one hundred seventeen".