19194277457 has 2 divisors, whose sum is σ = 19194277458. Its totient is φ = 19194277456.

The previous prime is 19194277391. The next prime is 19194277493. The reversal of 19194277457 is 75477249191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18713966401 + 480311056 = 136799^2 + 21916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19194277457 is a prime.

It is not a weakly prime, because it can be changed into another prime (19194270457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9597138728 + 9597138729.

It is an arithmetic number, because the mean of its divisors is an integer number (9597138729).

Almost surely, 2^19194277457 is an apocalyptic number.

It is an amenable number.

19194277457 is a deficient number, since it is larger than the sum of its proper divisors (1).

19194277457 is an equidigital number, since it uses as much as digits as its factorization.

19194277457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 56.

The spelling of 19194277457 in words is "nineteen billion, one hundred ninety-four million, two hundred seventy-seven thousand, four hundred fifty-seven".