19849740365 has 24 divisors (see below), whose sum is σ = 29477628288. Its totient is φ = 12564227520.

The previous prime is 19849740349. The next prime is 19849740377. The reversal of 19849740365 is 56304794891.

It is not a de Polignac number, because 19849740365 - 2⁴ = 19849740349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19849740365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1672001 + ... + 1683830.

It is an arithmetic number, because the mean of its divisors is an integer number (1228234512).

Almost surely, 2^19849740365 is an apocalyptic number.

It is an amenable number.

19849740365 is a deficient number, since it is larger than the sum of its proper divisors (9627887923).

19849740365 is a wasteful number, since it uses less digits than its factorization.

19849740365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355869 (or 3355856 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 19849740365 in words is "nineteen billion, eight hundred forty-nine million, seven hundred forty thousand, three hundred sixty-five".