669990111111 has 24 divisors (see below), whose sum is σ = 974826172320. Its totient is φ = 443407343616.

The previous prime is 669990111041. The next prime is 669990111199. The reversal of 669990111111 is 111111099966.

It is not a de Polignac number, because 669990111111 - 2³⁰ = 668916369287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669990111611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 865971 + ... + 1445643.

It is an arithmetic number, because the mean of its divisors is an integer number (40617757180).

Almost surely, 2^669990111111 is an apocalyptic number.

669990111111 is a deficient number, since it is larger than the sum of its proper divisors (304836061209).

669990111111 is a wasteful number, since it uses less digits than its factorization.

669990111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580615 (or 580612 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 45.

The spelling of 669990111111 in words is "six hundred sixty-nine billion, nine hundred ninety million, one hundred eleven thousand, one hundred eleven".