18506889490 has 16 divisors (see below), whose sum is σ = 33313972248. Its totient is φ = 7402406656.

The previous prime is 18506889461. The next prime is 18506889539. The reversal of 18506889490 is 9498860581.

It can be written as a sum of positive squares in 4 ways, for example, as 3138576529 + 15368312961 = 56023^2 + 123969^2 .

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, 337434 + ... + 388426.

Almost surely, 2^18506889490 is an apocalyptic number.

18506889490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18506889490 is a deficient number, since it is larger than the sum of its proper divisors (14807082758).

18506889490 is a wasteful number, since it uses less digits than its factorization.

18506889490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87293.

The product of its (nonzero) digits is 4976640, while the sum is 58.

The spelling of 18506889490 in words is "eighteen billion, five hundred six million, eight hundred eighty-nine thousand, four hundred ninety".