19775840256 has 140 divisors (see below), whose sum is σ = 59081750772. Its totient is φ = 6591725568.

The previous prime is 19775840237. The next prime is 19775840333. The reversal of 19775840256 is 65204857791.

19775840256 is a `hidden beast` number, since 1 + 9 + 7 + 7 + 584 + 0 + 2 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 648651 + ... + 678453.

Almost surely, 2^19775840256 is an apocalyptic number.

19775840256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19775840256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29540875386).

19775840256 is an abundant number, since it is smaller than the sum of its proper divisors (39305910516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19775840256 is an frugal number, since it uses more digits than its factorization.

19775840256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29841 (or 29808 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 19775840256 in words is "nineteen billion, seven hundred seventy-five million, eight hundred forty thousand, two hundred fifty-six".