18699458650 has 24 divisors (see below), whose sum is σ = 34833673404. Its totient is φ = 7468454400.

The previous prime is 18699458611. The next prime is 18699458731. The reversal of 18699458650 is 5685499681.

It can be written as a sum of positive squares in 6 ways, for example, as 15863150601 + 2836308049 = 125949^2 + 53257^2 .

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, 249847 + ... + 315946.

Almost surely, 2^18699458650 is an apocalyptic number.

18699458650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18699458650 is a deficient number, since it is larger than the sum of its proper divisors (16134214754).

18699458650 is a wasteful number, since it uses less digits than its factorization.

18699458650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566466 (or 566461 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 61.

The spelling of 18699458650 in words is "eighteen billion, six hundred ninety-nine million, four hundred fifty-eight thousand, six hundred fifty".