669051878918 has 8 divisors (see below), whose sum is σ = 1030701543312. Its totient is φ = 325484697816.

The previous prime is 669051878843. The next prime is 669051878959. The reversal of 669051878918 is 819878150966.

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

It is a super-2 number, since 2×669051878918² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4520620730 + ... + 4520620877.

It is an arithmetic number, because the mean of its divisors is an integer number (128837692914).

Almost surely, 2^669051878918 is an apocalyptic number.

669051878918 is a deficient number, since it is larger than the sum of its proper divisors (361649664394).

669051878918 is a wasteful number, since it uses less digits than its factorization.

669051878918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9041241646.

The product of its (nonzero) digits is 52254720, while the sum is 68.

The spelling of 669051878918 in words is "six hundred sixty-nine billion, fifty-one million, eight hundred seventy-eight thousand, nine hundred eighteen".