666704505 has 16 divisors (see below), whose sum is σ = 1067869440. Its totient is φ = 355195008.

The previous prime is 666704501. The next prime is 666704513. The reversal of 666704505 is 505407666.

It is not a de Polignac number, because 666704505 - 2² = 666704501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666704501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9025 + ... + 37614.

It is an arithmetic number, because the mean of its divisors is an integer number (66741840).

Almost surely, 2^666704505 is an apocalyptic number.

It is an amenable number.

666704505 is a deficient number, since it is larger than the sum of its proper divisors (401164935).

666704505 is a wasteful number, since it uses less digits than its factorization.

666704505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47600.

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 666704505 is about 25820.6217004936. The cubic root of 666704505 is about 873.5969918380.

The spelling of 666704505 in words is "six hundred sixty-six million, seven hundred four thousand, five hundred five".