18972972853 has 2 divisors, whose sum is σ = 18972972854. Its totient is φ = 18972972852.

The previous prime is 18972972841. The next prime is 18972972857. The reversal of 18972972853 is 35827927981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17034948324 + 1938024529 = 130518^2 + 44023^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18972972853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18972972791 and 18972972800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18972972857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9486486426 + 9486486427.

It is an arithmetic number, because the mean of its divisors is an integer number (9486486427).

Almost surely, 2^18972972853 is an apocalyptic number.

It is an amenable number.

18972972853 is a deficient number, since it is larger than the sum of its proper divisors (1).

18972972853 is an equidigital number, since it uses as much as digits as its factorization.

18972972853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15240960, while the sum is 61.

The spelling of 18972972853 in words is "eighteen billion, nine hundred seventy-two million, nine hundred seventy-two thousand, eight hundred fifty-three".