669012239 has 10 divisors (see below), whose sum is σ = 780470640. Its totient is φ = 573437004.

The previous prime is 669012217. The next prime is 669012259. The reversal of 669012239 is 932210966.

It is a de Polignac number, because none of the positive numbers 2^k-669012239 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 (669012259) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 136919 + ... + 141720.

It is an arithmetic number, because the mean of its divisors is an integer number (78047064).

Almost surely, 2^669012239 is an apocalyptic number.

669012239 is a deficient number, since it is larger than the sum of its proper divisors (111458401).

669012239 is an frugal number, since it uses more digits than its factorization.

669012239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278667 (or 278646 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 669012239 is about 25865.2709052119. The cubic root of 669012239 is about 874.6037886174.

The spelling of 669012239 in words is "six hundred sixty-nine million, twelve thousand, two hundred thirty-nine".