669706111 has 4 divisors (see below), whose sum is σ = 698823792. Its totient is φ = 640588432.

The previous prime is 669706073. The next prime is 669706117. The reversal of 669706111 is 111607966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111607966 = 2 ⋅55803983.

It is a cyclic number.

It is not a de Polignac number, because 669706111 - 2¹⁹ = 669181823 is a prime.

It is a super-2 number, since 2×669706111² = 897012550221488642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669706117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14558806 + ... + 14558851.

It is an arithmetic number, because the mean of its divisors is an integer number (174705948).

Almost surely, 2^669706111 is an apocalyptic number.

669706111 is a deficient number, since it is larger than the sum of its proper divisors (29117681).

669706111 is a wasteful number, since it uses less digits than its factorization.

669706111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29117680.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 669706111 is about 25878.6806271108. The cubic root of 669706111 is about 874.9060518452.

The spelling of 669706111 in words is "six hundred sixty-nine million, seven hundred six thousand, one hundred eleven".