669729919772 has 54 divisors (see below), whose sum is σ = 1254144173352. Its totient is φ = 312343116800.

The previous prime is 669729919769. The next prime is 669729919783. The reversal of 669729919772 is 277919927966.

It is a self number, because there is not a number n which added to its sum of digits gives 669729919772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 321829772 + ... + 321831852.

Almost surely, 2^669729919772 is an apocalyptic number.

It is an amenable number.

669729919772 is a deficient number, since it is larger than the sum of its proper divisors (584414253580).

669729919772 is an equidigital number, since it uses as much as digits as its factorization.

669729919772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271 (or 2147 counting only the distinct ones).

The product of its digits is 324060912, while the sum is 74.

The spelling of 669729919772 in words is "six hundred sixty-nine billion, seven hundred twenty-nine million, nine hundred nineteen thousand, seven hundred seventy-two".