18651065 has 12 divisors (see below), whose sum is σ = 23623524. Its totient is φ = 14134176.

The previous prime is 18651053. The next prime is 18651079. The reversal of 18651065 is 56015681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10310521 + 8340544 = 3211^2 + 2888^2 .

It is not a de Polignac number, because 18651065 - 2⁴ = 18651049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3362 + ... + 6971.

It is an arithmetic number, because the mean of its divisors is an integer number (1968627).

Almost surely, 2^18651065 is an apocalyptic number.

It is an amenable number.

18651065 is a deficient number, since it is larger than the sum of its proper divisors (4972459).

18651065 is a wasteful number, since it uses less digits than its factorization.

18651065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10376 (or 10357 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 18651065 is about 4318.6878794375. The cubic root of 18651065 is about 265.1965552553.

The spelling of 18651065 in words is "eighteen million, six hundred fifty-one thousand, sixty-five".