19049812857 has 12 divisors (see below), whose sum is σ = 27701072100. Its totient is φ = 12614640288.

The previous prime is 19049812853. The next prime is 19049812907. The reversal of 19049812857 is 75821894091.

It is a happy number.

19049812857 is a `hidden beast` number, since 1 + 90 + 498 + 12 + 8 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3119334201 + 15930478656 = 55851^2 + 126216^2 .

It is not a de Polignac number, because 19049812857 - 2² = 19049812853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19049812853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7101498 + ... + 7104179.

It is an arithmetic number, because the mean of its divisors is an integer number (2308422675).

Almost surely, 2^19049812857 is an apocalyptic number.

It is an amenable number.

19049812857 is a deficient number, since it is larger than the sum of its proper divisors (8651259243).

19049812857 is a wasteful number, since it uses less digits than its factorization.

19049812857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14205832 (or 14205829 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 19049812857 in words is "nineteen billion, forty-nine million, eight hundred twelve thousand, eight hundred fifty-seven".