694640665 has 8 divisors (see below), whose sum is σ = 877440960. Its totient is φ = 526464432.

The previous prime is 694640663. The next prime is 694640669. The reversal of 694640665 is 566046496.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 694640665 - 2¹ = 694640663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (694640663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3655909 + ... + 3656098.

It is an arithmetic number, because the mean of its divisors is an integer number (109680120).

Almost surely, 2^694640665 is an apocalyptic number.

It is an amenable number.

694640665 is a deficient number, since it is larger than the sum of its proper divisors (182800295).

694640665 is a wasteful number, since it uses less digits than its factorization.

694640665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7312031.

The product of its (nonzero) digits is 933120, while the sum is 46.

The square root of 694640665 is about 26356.0365950573. The cubic root of 694640665 is about 885.6322059796.

The spelling of 694640665 in words is "six hundred ninety-four million, six hundred forty thousand, six hundred sixty-five".