669392623 has 4 divisors (see below), whose sum is σ = 669653568. Its totient is φ = 669131680.

The previous prime is 669392617. The next prime is 669392639. The reversal of 669392623 is 326293966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326293966 = 2 ⋅163146983.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669392623 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 (669392693) 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, 126586 + ... + 131767.

It is an arithmetic number, because the mean of its divisors is an integer number (167413392).

Almost surely, 2^669392623 is an apocalyptic number.

669392623 is a deficient number, since it is larger than the sum of its proper divisors (260945).

669392623 is a wasteful number, since it uses less digits than its factorization.

669392623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260944.

The product of its digits is 629856, while the sum is 46.

The square root of 669392623 is about 25872.6230405809. The cubic root of 669392623 is about 874.7695166544.

The spelling of 669392623 in words is "six hundred sixty-nine million, three hundred ninety-two thousand, six hundred twenty-three".