669794539 has 2 divisors, whose sum is σ = 669794540. Its totient is φ = 669794538.

The previous prime is 669794533. The next prime is 669794591. The reversal of 669794539 is 935497966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669794539 - 2²³ = 661405931 is a prime.

It is not a weakly prime, because it can be changed into another prime (669794533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334897269 + 334897270.

It is an arithmetic number, because the mean of its divisors is an integer number (334897270).

Almost surely, 2^669794539 is an apocalyptic number.

669794539 is a deficient number, since it is larger than the sum of its proper divisors (1).

669794539 is an equidigital number, since it uses as much as digits as its factorization.

669794539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 58.

The square root of 669794539 is about 25880.3890813102. The cubic root of 669794539 is about 874.9445576844.

The spelling of 669794539 in words is "six hundred sixty-nine million, seven hundred ninety-four thousand, five hundred thirty-nine".