19853970845 has 16 divisors (see below), whose sum is σ = 23959152000. Its totient is φ = 15793819584.

The previous prime is 19853970839. The next prime is 19853970847. The reversal of 19853970845 is 54807935891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19853970845 is a prime.

It is a super-2 number, since 2×19853970845² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19853970847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 682406 + ... + 710904.

It is an arithmetic number, because the mean of its divisors is an integer number (1497447000).

Almost surely, 2^19853970845 is an apocalyptic number.

It is an amenable number.

19853970845 is a deficient number, since it is larger than the sum of its proper divisors (4105181155).

19853970845 is a wasteful number, since it uses less digits than its factorization.

19853970845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29284.

The product of its (nonzero) digits is 10886400, while the sum is 59.

The spelling of 19853970845 in words is "nineteen billion, eight hundred fifty-three million, nine hundred seventy thousand, eight hundred forty-five".