19457285657 has 2 divisors, whose sum is σ = 19457285658. Its totient is φ = 19457285656.

The previous prime is 19457285633. The next prime is 19457285699. The reversal of 19457285657 is 75658275491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18706306441 + 750979216 = 136771^2 + 27404^2 .

It is an emirp because it is prime and its reverse (75658275491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19457285657 - 2¹⁶ = 19457220121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19457285596 and 19457285605.

It is not a weakly prime, because it can be changed into another prime (19457285557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9728642828 + 9728642829.

It is an arithmetic number, because the mean of its divisors is an integer number (9728642829).

Almost surely, 2^19457285657 is an apocalyptic number.

It is an amenable number.

19457285657 is a deficient number, since it is larger than the sum of its proper divisors (1).

19457285657 is an equidigital number, since it uses as much as digits as its factorization.

19457285657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168000, while the sum is 59.

The spelling of 19457285657 in words is "nineteen billion, four hundred fifty-seven million, two hundred eighty-five thousand, six hundred fifty-seven".