18666019394 has 16 divisors (see below), whose sum is σ = 30554331840. Its totient is φ = 8481794160.

The previous prime is 18666019327. The next prime is 18666019409. The reversal of 18666019394 is 49391066681.

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, 68054 + ... + 204849.

It is an arithmetic number, because the mean of its divisors is an integer number (1909645740).

Almost surely, 2^18666019394 is an apocalyptic number.

18666019394 is a deficient number, since it is larger than the sum of its proper divisors (11888312446).

18666019394 is a wasteful number, since it uses less digits than its factorization.

18666019394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276025.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 18666019394 in words is "eighteen billion, six hundred sixty-six million, nineteen thousand, three hundred ninety-four".