19749598856 has 32 divisors (see below), whose sum is σ = 39925603200. Its totient is φ = 9104546880.

The previous prime is 19749598801. The next prime is 19749598859. The reversal of 19749598856 is 65889594791.

It is a self number, because there is not a number n which added to its sum of digits gives 19749598856.

It is not an unprimeable number, because it can be changed into a prime (19749598859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21200 + ... + 199871.

It is an arithmetic number, because the mean of its divisors is an integer number (1247675100).

Almost surely, 2^19749598856 is an apocalyptic number.

It is an amenable number.

19749598856 is an abundant number, since it is smaller than the sum of its proper divisors (20176004344).

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

19749598856 is a wasteful number, since it uses less digits than its factorization.

19749598856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221949 (or 221945 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 71.

The spelling of 19749598856 in words is "nineteen billion, seven hundred forty-nine million, five hundred ninety-eight thousand, eight hundred fifty-six".