19850643965 has 8 divisors (see below), whose sum is σ = 25074497760. Its totient is φ = 15044698512.

The previous prime is 19850643913. The next prime is 19850643983. The reversal of 19850643965 is 56934605891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19850643965 - 2¹⁴ = 19850627581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19850643965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104476979 + ... + 104477168.

It is an arithmetic number, because the mean of its divisors is an integer number (3134312220).

Almost surely, 2^19850643965 is an apocalyptic number.

It is an amenable number.

19850643965 is a deficient number, since it is larger than the sum of its proper divisors (5223853795).

19850643965 is a wasteful number, since it uses less digits than its factorization.

19850643965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208954171.

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 19850643965 in words is "nineteen billion, eight hundred fifty million, six hundred forty-three thousand, nine hundred sixty-five".