123581166 has 16 divisors (see below), whose sum is σ = 248593104. Its totient is φ = 40955264.

The previous prime is 123581153. The next prime is 123581173. The reversal of 123581166 is 661185321.

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, 58491 + ... + 60566.

It is an arithmetic number, because the mean of its divisors is an integer number (15537069).

Almost surely, 2^123581166 is an apocalyptic number.

123581166 is an abundant number, since it is smaller than the sum of its proper divisors (125011938).

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

123581166 is a wasteful number, since it uses less digits than its factorization.

123581166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119235.

The product of its digits is 8640, while the sum is 33.

The square root of 123581166 is about 11116.7066166199. The cubic root of 123581166 is about 498.1010182002.

The spelling of 123581166 in words is "one hundred twenty-three million, five hundred eighty-one thousand, one hundred sixty-six".