19857892793 has 2 divisors, whose sum is σ = 19857892794. Its totient is φ = 19857892792.

The previous prime is 19857892787. The next prime is 19857892853. The reversal of 19857892793 is 39729875891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18601686544 + 1256206249 = 136388^2 + 35443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19857892793 is a prime.

It is not a weakly prime, because it can be changed into another prime (19857892723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9928946396 + 9928946397.

It is an arithmetic number, because the mean of its divisors is an integer number (9928946397).

Almost surely, 2^19857892793 is an apocalyptic number.

It is an amenable number.

19857892793 is a deficient number, since it is larger than the sum of its proper divisors (1).

19857892793 is an equidigital number, since it uses as much as digits as its factorization.

19857892793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68584320, while the sum is 68.

The spelling of 19857892793 in words is "nineteen billion, eight hundred fifty-seven million, eight hundred ninety-two thousand, seven hundred ninety-three".