19026561838 has 4 divisors (see below), whose sum is σ = 28539842760. Its totient is φ = 9513280918.

The previous prime is 19026561811. The next prime is 19026561847. The reversal of 19026561838 is 83816562091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83816562091 = 29 ⋅2890226279.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 19026561791 and 19026561800.

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, 4756640458 + ... + 4756640461.

It is an arithmetic number, because the mean of its divisors is an integer number (7134960690).

Almost surely, 2^19026561838 is an apocalyptic number.

19026561838 is a deficient number, since it is larger than the sum of its proper divisors (9513280922).

19026561838 is an equidigital number, since it uses as much as digits as its factorization.

19026561838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9513280921.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 19026561838 in words is "nineteen billion, twenty-six million, five hundred sixty-one thousand, eight hundred thirty-eight".