666632623 has 4 divisors (see below), whose sum is σ = 673233048. Its totient is φ = 660032200.

The previous prime is 666632609. The next prime is 666632633. The reversal of 666632623 is 326236666.

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 666632623 - 2²¹ = 664535471 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 (666632633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3300061 + ... + 3300262.

It is an arithmetic number, because the mean of its divisors is an integer number (168308262).

Almost surely, 2^666632623 is an apocalyptic number.

666632623 is a deficient number, since it is larger than the sum of its proper divisors (6600425).

666632623 is a wasteful number, since it uses less digits than its factorization.

666632623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6600424.

The product of its digits is 279936, while the sum is 40.

The square root of 666632623 is about 25819.2297135294. The cubic root of 666632623 is about 873.5655945421.

The spelling of 666632623 in words is "six hundred sixty-six million, six hundred thirty-two thousand, six hundred twenty-three".