19894876066 has 32 divisors (see below), whose sum is σ = 32573459520. Its totient is φ = 9058129344.

The previous prime is 19894876013. The next prime is 19894876081. The reversal of 19894876066 is 66067849891.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19894875989 and 19894876007.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1523521 + ... + 1536523.

It is an arithmetic number, because the mean of its divisors is an integer number (1017920610).

Almost surely, 2^19894876066 is an apocalyptic number.

19894876066 is a deficient number, since it is larger than the sum of its proper divisors (12678583454).

19894876066 is a wasteful number, since it uses less digits than its factorization.

19894876066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13810.

The product of its (nonzero) digits is 31352832, while the sum is 64.

The spelling of 19894876066 in words is "nineteen billion, eight hundred ninety-four million, eight hundred seventy-six thousand, sixty-six".