665374999 has 2 divisors, whose sum is σ = 665375000. Its totient is φ = 665374998.

The previous prime is 665374967. The next prime is 665375017. The reversal of 665374999 is 999473566.

665374999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665374999 - 2⁵ = 665374967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665372999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332687499 + 332687500.

It is an arithmetic number, because the mean of its divisors is an integer number (332687500).

Almost surely, 2^665374999 is an apocalyptic number.

665374999 is a deficient number, since it is larger than the sum of its proper divisors (1).

665374999 is an equidigital number, since it uses as much as digits as its factorization.

665374999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11022480, while the sum is 58.

The square root of 665374999 is about 25794.8638104565. The cubic root of 665374999 is about 873.0159121517.

The spelling of 665374999 in words is "six hundred sixty-five million, three hundred seventy-four thousand, nine hundred ninety-nine".