666704739 has 32 divisors (see below), whose sum is σ = 934126336. Its totient is φ = 422547840.

The previous prime is 666704681. The next prime is 666704747. The reversal of 666704739 is 937407666.

It is not a de Polignac number, because 666704739 - 2⁸ = 666704483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666704789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1167324 + ... + 1167894.

It is an arithmetic number, because the mean of its divisors is an integer number (29191448).

Almost surely, 2^666704739 is an apocalyptic number.

666704739 is a deficient number, since it is larger than the sum of its proper divisors (267421597).

666704739 is a wasteful number, since it uses less digits than its factorization.

666704739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835.

The product of its (nonzero) digits is 1143072, while the sum is 48.

The square root of 666704739 is about 25820.6262317551. The cubic root of 666704739 is about 873.5970940431.

The spelling of 666704739 in words is "six hundred sixty-six million, seven hundred four thousand, seven hundred thirty-nine".