665675690 has 16 divisors (see below), whose sum is σ = 1226082528. Its totient is φ = 260077776.

The previous prime is 665675677. The next prime is 665675723. The reversal of 665675690 is 96576566.

It is a super-2 number, since 2×665675690² = 886248248513952200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773612 + ... + 774471.

It is an arithmetic number, because the mean of its divisors is an integer number (76630158).

Almost surely, 2^665675690 is an apocalyptic number.

665675690 is a deficient number, since it is larger than the sum of its proper divisors (560406838).

665675690 is a wasteful number, since it uses less digits than its factorization.

665675690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548133.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The square root of 665675690 is about 25800.6916573955. The cubic root of 665675690 is about 873.1474011589.

The spelling of 665675690 in words is "six hundred sixty-five million, six hundred seventy-five thousand, six hundred ninety".