19794491253 has 6 divisors (see below), whose sum is σ = 28592042934. Its totient is φ = 13196327496.

The previous prime is 19794491243. The next prime is 19794491267. The reversal of 19794491253 is 35219449791.

19794491253 is a `hidden beast` number, since 1 + 9 + 79 + 449 + 125 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14597955684 + 5196535569 = 120822^2 + 72087^2 .

It is not a de Polignac number, because 19794491253 - 2¹² = 19794487157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19794491253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19794491243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1099693950 + ... + 1099693967.

It is an arithmetic number, because the mean of its divisors is an integer number (4765340489).

Almost surely, 2^19794491253 is an apocalyptic number.

It is an amenable number.

19794491253 is a deficient number, since it is larger than the sum of its proper divisors (8797551681).

19794491253 is a wasteful number, since it uses less digits than its factorization.

19794491253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199387923 (or 2199387920 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The spelling of 19794491253 in words is "nineteen billion, seven hundred ninety-four million, four hundred ninety-one thousand, two hundred fifty-three".