18250118649 has 45 divisors (see below), whose sum is σ = 30786499653. Its totient is φ = 10417291416.

The previous prime is 18250118639. The next prime is 18250118651. The reversal of 18250118649 is 94681105281.

It is a happy number.

The square root of 18250118649 is 135093.

It is a perfect power (a square), and thus also a powerful number.

18250118649 is a `hidden beast` number, since 1 + 82 + 501 + 1 + 8 + 64 + 9 = 666.

It is not a de Polignac number, because 18250118649 - 2⁵ = 18250118617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18250118639) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 19858212 + ... + 19859130.

Almost surely, 2^18250118649 is an apocalyptic number.

18250118649 is the 135093-rd square number.

18250118649 is the 67547-th centered octagonal number.

It is an amenable number.

18250118649 is a deficient number, since it is larger than the sum of its proper divisors (12536381004).

18250118649 is an frugal number, since it uses more digits than its factorization.

18250118649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 18250118649 in words is "eighteen billion, two hundred fifty million, one hundred eighteen thousand, six hundred forty-nine".