665622701 has 2 divisors, whose sum is σ = 665622702. Its totient is φ = 665622700.

The previous prime is 665622679. The next prime is 665622721. The reversal of 665622701 is 107226566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 424566025 + 241056676 = 20605^2 + 15526^2 .

It is a cyclic number.

It is not a de Polignac number, because 665622701 - 2²⁶ = 598513837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665622721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332811350 + 332811351.

It is an arithmetic number, because the mean of its divisors is an integer number (332811351).

Almost surely, 2^665622701 is an apocalyptic number.

It is an amenable number.

665622701 is a deficient number, since it is larger than the sum of its proper divisors (1).

665622701 is an equidigital number, since it uses as much as digits as its factorization.

665622701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 665622701 is about 25799.6647458838. The cubic root of 665622701 is about 873.1242325018.

The spelling of 665622701 in words is "six hundred sixty-five million, six hundred twenty-two thousand, seven hundred one".