19875281677 has 2 divisors, whose sum is σ = 19875281678. Its totient is φ = 19875281676.

The previous prime is 19875281659. The next prime is 19875281681. The reversal of 19875281677 is 77618257891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10035832041 + 9839449636 = 100179^2 + 99194^2 .

It is an emirp because it is prime and its reverse (77618257891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19875281677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19875281477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9937640838 + 9937640839.

It is an arithmetic number, because the mean of its divisors is an integer number (9937640839).

Almost surely, 2^19875281677 is an apocalyptic number.

It is an amenable number.

19875281677 is a deficient number, since it is larger than the sum of its proper divisors (1).

19875281677 is an equidigital number, since it uses as much as digits as its factorization.

19875281677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11854080, while the sum is 61.

The spelling of 19875281677 in words is "nineteen billion, eight hundred seventy-five million, two hundred eighty-one thousand, six hundred seventy-seven".