665889299 has 2 divisors, whose sum is σ = 665889300. Its totient is φ = 665889298.

The previous prime is 665889277. The next prime is 665889311. The reversal of 665889299 is 992988566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665889299 - 2⁸ = 665889043 is a prime.

It is a super-2 number, since 2×665889299² = 886817117045422802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (665889209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332944649 + 332944650.

It is an arithmetic number, because the mean of its divisors is an integer number (332944650).

Almost surely, 2^665889299 is an apocalyptic number.

665889299 is a deficient number, since it is larger than the sum of its proper divisors (1).

665889299 is an equidigital number, since it uses as much as digits as its factorization.

665889299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16796160, while the sum is 62.

The square root of 665889299 is about 25804.8309236856. The cubic root of 665889299 is about 873.2407860707.

The spelling of 665889299 in words is "six hundred sixty-five million, eight hundred eighty-nine thousand, two hundred ninety-nine".