666624501 has 6 divisors (see below), whose sum is σ = 962902070. Its totient is φ = 444416328.

The previous prime is 666624487. The next prime is 666624577. The reversal of 666624501 is 105426666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 664866225 + 1758276 = 25785^2 + 1326^2 .

It is not a de Polignac number, because 666624501 - 2⁶ = 666624437 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 (666624701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37034686 + ... + 37034703.

Almost surely, 2^666624501 is an apocalyptic number.

It is an amenable number.

666624501 is a deficient number, since it is larger than the sum of its proper divisors (296277569).

666624501 is a wasteful number, since it uses less digits than its factorization.

666624501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74069395 (or 74069392 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 666624501 is about 25819.0724271806. The cubic root of 666624501 is about 873.5620467966.

The spelling of 666624501 in words is "six hundred sixty-six million, six hundred twenty-four thousand, five hundred one".