19772254189 has 2 divisors, whose sum is σ = 19772254190. Its totient is φ = 19772254188.

The previous prime is 19772254169. The next prime is 19772254211. The reversal of 19772254189 is 98145227791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16675331689 + 3096922500 = 129133^2 + 55650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19772254189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19772254169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9886127094 + 9886127095.

It is an arithmetic number, because the mean of its divisors is an integer number (9886127095).

Almost surely, 2^19772254189 is an apocalyptic number.

It is an amenable number.

19772254189 is a deficient number, since it is larger than the sum of its proper divisors (1).

19772254189 is an equidigital number, since it uses as much as digits as its factorization.

19772254189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 55.

The spelling of 19772254189 in words is "nineteen billion, seven hundred seventy-two million, two hundred fifty-four thousand, one hundred eighty-nine".