18081656 has 16 divisors (see below), whose sum is σ = 34730640. Its totient is φ = 8820160.

The previous prime is 18081653. The next prime is 18081667. The reversal of 18081656 is 65618081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081653) 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, 27236 + ... + 27891.

It is an arithmetic number, because the mean of its divisors is an integer number (2170665).

Almost surely, 2^18081656 is an apocalyptic number.

It is an amenable number.

18081656 is a deficient number, since it is larger than the sum of its proper divisors (16648984).

18081656 is a wasteful number, since it uses less digits than its factorization.

18081656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55174 (or 55170 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18081656 is about 4252.2530498549. The cubic root of 18081656 is about 262.4698365946.

It can be divided in two parts, 18081 and 656, that multiplied together give a square (11861136 = 3444²).

The spelling of 18081656 in words is "eighteen million, eighty-one thousand, six hundred fifty-six".