19042978558 has 4 divisors (see below), whose sum is σ = 28564467840. Its totient is φ = 9521489278.

The previous prime is 19042978543. The next prime is 19042978583. The reversal of 19042978558 is 85587924091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85587924091 = 239 ⋅358108469.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4760744638 + ... + 4760744641.

It is an arithmetic number, because the mean of its divisors is an integer number (7141116960).

Almost surely, 2^19042978558 is an apocalyptic number.

19042978558 is a deficient number, since it is larger than the sum of its proper divisors (9521489282).

19042978558 is an equidigital number, since it uses as much as digits as its factorization.

19042978558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9521489281.

The product of its (nonzero) digits is 7257600, while the sum is 58.

The spelling of 19042978558 in words is "nineteen billion, forty-two million, nine hundred seventy-eight thousand, five hundred fifty-eight".