666777704 has 8 divisors (see below), whose sum is σ = 1250208210. Its totient is φ = 333388848.

The previous prime is 666777691. The next prime is 666777707. The reversal of 666777704 is 407777666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 658948900 + 7828804 = 25670^2 + 2798^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×666777704³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (666777707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41673599 + ... + 41673614.

Almost surely, 2^666777704 is an apocalyptic number.

It is an amenable number.

666777704 is a deficient number, since it is larger than the sum of its proper divisors (583430506).

666777704 is a wasteful number, since it uses less digits than its factorization.

666777704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83347219 (or 83347215 counting only the distinct ones).

The product of its (nonzero) digits is 2074464, while the sum is 50.

The square root of 666777704 is about 25822.0391139042. The cubic root of 666777704 is about 873.6289620665.

The spelling of 666777704 in words is "six hundred sixty-six million, seven hundred seventy-seven thousand, seven hundred four".