669931804849 has 8 divisors (see below), whose sum is σ = 684766809792. Its totient is φ = 655178088240.

The previous prime is 669931804813. The next prime is 669931804877. The reversal of 669931804849 is 948408139966.

669931804849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 669931804849 - 2²³ = 669923416241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669731804849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20305419 + ... + 20338384.

It is an arithmetic number, because the mean of its divisors is an integer number (85595851224).

Almost surely, 2^669931804849 is an apocalyptic number.

It is an amenable number.

669931804849 is a deficient number, since it is larger than the sum of its proper divisors (14835004943).

669931804849 is a wasteful number, since it uses less digits than its factorization.

669931804849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40644167.

The product of its (nonzero) digits is 80621568, while the sum is 67.

The spelling of 669931804849 in words is "six hundred sixty-nine billion, nine hundred thirty-one million, eight hundred four thousand, eight hundred forty-nine".