669042423 has 96 divisors (see below), whose sum is σ = 1223040000. Its totient is φ = 364639968.

The previous prime is 669042419. The next prime is 669042433. The reversal of 669042423 is 324240966.

It is not a de Polignac number, because 669042423 - 2² = 669042419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669042433) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1916853 + ... + 1917201.

It is an arithmetic number, because the mean of its divisors is an integer number (12740000).

Almost surely, 2^669042423 is an apocalyptic number.

669042423 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

669042423 is a deficient number, since it is larger than the sum of its proper divisors (553997577).

669042423 is an equidigital number, since it uses as much as digits as its factorization.

669042423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 669042423 is about 25865.8543837237. The cubic root of 669042423 is about 874.6169416622.

The spelling of 669042423 in words is "six hundred sixty-nine million, forty-two thousand, four hundred twenty-three".