623404666 has 4 divisors (see below), whose sum is σ = 935107002. Its totient is φ = 311702332.

The previous prime is 623404651. The next prime is 623404759. The reversal of 623404666 is 666404326.

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

It can be written as a sum of positive squares in only one way, i.e., 534950641 + 88454025 = 23129^2 + 9405^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155851165 + ... + 155851168.

Almost surely, 2^623404666 is an apocalyptic number.

623404666 is a deficient number, since it is larger than the sum of its proper divisors (311702336).

623404666 is a wasteful number, since it uses less digits than its factorization.

623404666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311702335.

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 623404666 is about 24968.0729332482. The cubic root of 623404666 is about 854.2598914306.

The spelling of 623404666 in words is "six hundred twenty-three million, four hundred four thousand, six hundred sixty-six".