19857488407 has 2 divisors, whose sum is σ = 19857488408. Its totient is φ = 19857488406.

The previous prime is 19857488377. The next prime is 19857488419. The reversal of 19857488407 is 70488475891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19857488407 - 2²³ = 19849099799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19857488447) 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, 9928744203 + 9928744204.

It is an arithmetic number, because the mean of its divisors is an integer number (9928744204).

Almost surely, 2^19857488407 is an apocalyptic number.

19857488407 is a deficient number, since it is larger than the sum of its proper divisors (1).

19857488407 is an equidigital number, since it uses as much as digits as its factorization.

19857488407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18063360, while the sum is 61.

The spelling of 19857488407 in words is "nineteen billion, eight hundred fifty-seven million, four hundred eighty-eight thousand, four hundred seven".