19781255368 has 16 divisors (see below), whose sum is σ = 42388404480. Its totient is φ = 8477680848.

The previous prime is 19781255327. The next prime is 19781255383. The reversal of 19781255368 is 86355218791.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176618296 + ... + 176618407.

It is an arithmetic number, because the mean of its divisors is an integer number (2649275280).

Almost surely, 2^19781255368 is an apocalyptic number.

It is an amenable number.

19781255368 is an abundant number, since it is smaller than the sum of its proper divisors (22607149112).

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

19781255368 is a wasteful number, since it uses less digits than its factorization.

19781255368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353236716 (or 353236712 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 55.

The spelling of 19781255368 in words is "nineteen billion, seven hundred eighty-one million, two hundred fifty-five thousand, three hundred sixty-eight".