666624451 has 12 divisors (see below), whose sum is σ = 709955920. Its totient is φ = 625806720.

The previous prime is 666624437. The next prime is 666624487. The reversal of 666624451 is 154426666.

It is not a de Polignac number, because 666624451 - 2⁵ = 666624419 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666624251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118930 + ... + 124408.

Almost surely, 2^666624451 is an apocalyptic number.

666624451 is a deficient number, since it is larger than the sum of its proper divisors (43331469).

666624451 is a wasteful number, since it uses less digits than its factorization.

666624451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5934 (or 5917 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 666624451 is about 25819.0714589042. The cubic root of 666624451 is about 873.5620249562.

The spelling of 666624451 in words is "six hundred sixty-six million, six hundred twenty-four thousand, four hundred fifty-one".