666455479 has 4 divisors (see below), whose sum is σ = 667084680. Its totient is φ = 665826280.

The previous prime is 666455459. The next prime is 666455497. The reversal of 666455479 is 974554666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666455479 - 2¹⁵ = 666422711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666455459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313009 + ... + 315130.

It is an arithmetic number, because the mean of its divisors is an integer number (166771170).

Almost surely, 2^666455479 is an apocalyptic number.

666455479 is a deficient number, since it is larger than the sum of its proper divisors (629201).

666455479 is a wasteful number, since it uses less digits than its factorization.

666455479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629200.

The product of its digits is 5443200, while the sum is 52.

The square root of 666455479 is about 25815.7990192053. The cubic root of 666455479 is about 873.4882102841.

The spelling of 666455479 in words is "six hundred sixty-six million, four hundred fifty-five thousand, four hundred seventy-nine".