665622959 has 2 divisors, whose sum is σ = 665622960. Its totient is φ = 665622958.

The previous prime is 665622851. The next prime is 665623001. The reversal of 665622959 is 959226566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665622959 - 2¹⁶ = 665557423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665622059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332811479 + 332811480.

It is an arithmetic number, because the mean of its divisors is an integer number (332811480).

Almost surely, 2^665622959 is an apocalyptic number.

665622959 is a deficient number, since it is larger than the sum of its proper divisors (1).

665622959 is an equidigital number, since it uses as much as digits as its factorization.

665622959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 50.

The square root of 665622959 is about 25799.6697459483. The cubic root of 665622959 is about 873.1243453115.

The spelling of 665622959 in words is "six hundred sixty-five million, six hundred twenty-two thousand, nine hundred fifty-nine".