19857488377 has 2 divisors, whose sum is σ = 19857488378. Its totient is φ = 19857488376.

The previous prime is 19857488363. The next prime is 19857488407. The reversal of 19857488377 is 77388475891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18631158016 + 1226330361 = 136496^2 + 35019^2 .

It is a cyclic number.

It is not a de Polignac number, because 19857488377 - 2¹¹ = 19857486329 is a prime.

It is not a weakly prime, because it can be changed into another prime (19857488477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9928744188 + 9928744189.

It is an arithmetic number, because the mean of its divisors is an integer number (9928744189).

Almost surely, 2^19857488377 is an apocalyptic number.

It is an amenable number.

19857488377 is a deficient number, since it is larger than the sum of its proper divisors (1).

19857488377 is an equidigital number, since it uses as much as digits as its factorization.

19857488377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94832640, while the sum is 67.

The spelling of 19857488377 in words is "nineteen billion, eight hundred fifty-seven million, four hundred eighty-eight thousand, three hundred seventy-seven".