18784290466 has 16 divisors (see below), whose sum is σ = 29858968440. Its totient is φ = 8847099520.

The previous prime is 18784290449. The next prime is 18784290517. The reversal of 18784290466 is 66409248781.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5855463441 + 12928827025 = 76521^2 + 113705^2 .

It is a super-2 number, since 2×18784290466² (a number of 21 digits) contains 22 as substring.

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, 3947221 + ... + 3951976.

Almost surely, 2^18784290466 is an apocalyptic number.

18784290466 is a deficient number, since it is larger than the sum of its proper divisors (11074677974).

18784290466 is a wasteful number, since it uses less digits than its factorization.

18784290466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7899269.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 18784290466 in words is "eighteen billion, seven hundred eighty-four million, two hundred ninety thousand, four hundred sixty-six".