19782810257 has 16 divisors (see below), whose sum is σ = 24171293952. Its totient is φ = 15804288000.

The previous prime is 19782810251. The next prime is 19782810283. The reversal of 19782810257 is 75201828791.

It is not a de Polignac number, because 19782810257 - 2¹⁴ = 19782793873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19782810251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 794744 + ... + 819257.

It is an arithmetic number, because the mean of its divisors is an integer number (1510705872).

Almost surely, 2^19782810257 is an apocalyptic number.

19782810257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19782810257 is a deficient number, since it is larger than the sum of its proper divisors (4388483695).

19782810257 is a wasteful number, since it uses less digits than its factorization.

19782810257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614128.

The product of its (nonzero) digits is 564480, while the sum is 50.

The spelling of 19782810257 in words is "nineteen billion, seven hundred eighty-two million, eight hundred ten thousand, two hundred fifty-seven".