670137665 has 4 divisors (see below), whose sum is σ = 804165204. Its totient is φ = 536110128.

The previous prime is 670137653. The next prime is 670137679. The reversal of 670137665 is 566731076.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 446096641 + 224041024 = 21121^2 + 14968^2 .

It is a cyclic number.

It is not a de Polignac number, because 670137665 - 2²⁸ = 401702209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67013762 + ... + 67013771.

It is an arithmetic number, because the mean of its divisors is an integer number (201041301).

Almost surely, 2^670137665 is an apocalyptic number.

It is an amenable number.

670137665 is a deficient number, since it is larger than the sum of its proper divisors (134027539).

670137665 is a wasteful number, since it uses less digits than its factorization.

670137665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134027538.

The product of its (nonzero) digits is 158760, while the sum is 41.

The square root of 670137665 is about 25887.0173059779. The cubic root of 670137665 is about 875.0939393021.

The spelling of 670137665 in words is "six hundred seventy million, one hundred thirty-seven thousand, six hundred sixty-five".