19802359161 has 24 divisors (see below), whose sum is σ = 30816556680. Its totient is φ = 12180969216.

The previous prime is 19802359153. The next prime is 19802359163. The reversal of 19802359161 is 16195320891.

It can be written as a sum of positive squares in 4 ways, for example, as 4346896761 + 15455462400 = 65931^2 + 124320^2 .

It is not a de Polignac number, because 19802359161 - 2³ = 19802359153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19802359163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255645 + ... + 323973.

It is an arithmetic number, because the mean of its divisors is an integer number (1284023195).

Almost surely, 2^19802359161 is an apocalyptic number.

It is an amenable number.

19802359161 is a deficient number, since it is larger than the sum of its proper divisors (11014197519).

19802359161 is a wasteful number, since it uses less digits than its factorization.

19802359161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70825 (or 70822 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 19802359161 in words is "nineteen billion, eight hundred two million, three hundred fifty-nine thousand, one hundred sixty-one".