18661439194 has 32 divisors (see below), whose sum is σ = 28855322496. Its totient is φ = 9046416960.

The previous prime is 18661439149. The next prime is 18661439221. The reversal of 18661439194 is 49193416681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13650699 + ... + 13652065.

It is an arithmetic number, because the mean of its divisors is an integer number (901728828).

Almost surely, 2^18661439194 is an apocalyptic number.

18661439194 is a deficient number, since it is larger than the sum of its proper divisors (10193883302).

18661439194 is a wasteful number, since it uses less digits than its factorization.

18661439194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470.

The product of its digits is 1119744, while the sum is 52.

The spelling of 18661439194 in words is "eighteen billion, six hundred sixty-one million, four hundred thirty-nine thousand, one hundred ninety-four".