665713690 has 8 divisors (see below), whose sum is σ = 1198284660. Its totient is φ = 266285472.

The previous prime is 665713663. The next prime is 665713717. The reversal of 665713690 is 96317566.

It is an interprime number because it is at equal distance from previous prime (665713663) and next prime (665713717).

It can be written as a sum of positive squares in 2 ways, for example, as 642064921 + 23648769 = 25339^2 + 4863^2 .

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

It is a super-2 number, since 2×665713690² = 886349434106832200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33285675 + ... + 33285694.

Almost surely, 2^665713690 is an apocalyptic number.

665713690 is a deficient number, since it is larger than the sum of its proper divisors (532570970).

665713690 is a wasteful number, since it uses less digits than its factorization.

665713690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66571376.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 665713690 is about 25801.4280612527. The cubic root of 665713690 is about 873.1640153403.

The spelling of 665713690 in words is "six hundred sixty-five million, seven hundred thirteen thousand, six hundred ninety".