669935805 has 32 divisors (see below), whose sum is σ = 1336393728. Its totient is φ = 278414400.

The previous prime is 669935797. The next prime is 669935809. The reversal of 669935805 is 508539966.

It is not a de Polignac number, because 669935805 - 2³ = 669935797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669935809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 288861 + ... + 291170.

It is an arithmetic number, because the mean of its divisors is an integer number (41762304).

Almost surely, 2^669935805 is an apocalyptic number.

It is an amenable number.

669935805 is a deficient number, since it is larger than the sum of its proper divisors (666457923).

669935805 is a wasteful number, since it uses less digits than its factorization.

669935805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580057.

The product of its (nonzero) digits is 1749600, while the sum is 51.

The square root of 669935805 is about 25883.1181467767. The cubic root of 669935805 is about 875.0060647199.

The spelling of 669935805 in words is "six hundred sixty-nine million, nine hundred thirty-five thousand, eight hundred five".