19189917146 has 4 divisors (see below), whose sum is σ = 28784875722. Its totient is φ = 9594958572.

The previous prime is 19189917077. The next prime is 19189917157. The reversal of 19189917146 is 64171998191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10218985921 + 8970931225 = 101089^2 + 94715^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19189917091 and 19189917100.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4797479285 + ... + 4797479288.

Almost surely, 2^19189917146 is an apocalyptic number.

19189917146 is a deficient number, since it is larger than the sum of its proper divisors (9594958576).

19189917146 is an equidigital number, since it uses as much as digits as its factorization.

19189917146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9594958575.

The product of its digits is 979776, while the sum is 56.

The spelling of 19189917146 in words is "nineteen billion, one hundred eighty-nine million, nine hundred seventeen thousand, one hundred forty-six".