123165564 has 24 divisors (see below), whose sum is σ = 291677568. Its totient is φ = 40442160.

The previous prime is 123165547. The next prime is 123165643. The reversal of 123165564 is 465561321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75792 + ... + 77399.

It is an arithmetic number, because the mean of its divisors is an integer number (12153232).

Almost surely, 2^123165564 is an apocalyptic number.

It is an amenable number.

123165564 is an abundant number, since it is smaller than the sum of its proper divisors (168512004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123165564 is a wasteful number, since it uses less digits than its factorization.

123165564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153265 (or 153263 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 123165564 is about 11097.9981978733. The cubic root of 123165564 is about 497.5420218202.

It can be divided in two parts, 1231 and 65564, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 123165564 in words is "one hundred twenty-three million, one hundred sixty-five thousand, five hundred sixty-four".