19961717364 has 36 divisors (see below), whose sum is σ = 50655146724. Its totient is φ = 6628012032.

The previous prime is 19961717341. The next prime is 19961717383. The reversal of 19961717364 is 46371716991.

19961717364 is a `hidden beast` number, since 1 + 9 + 9 + 617 + 17 + 3 + 6 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12733316964 + 7228400400 = 112842^2 + 85020^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 19961717364.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1069527 + ... + 1088030.

It is an arithmetic number, because the mean of its divisors is an integer number (1407087409).

Almost surely, 2^19961717364 is an apocalyptic number.

It is an amenable number.

19961717364 is an abundant number, since it is smaller than the sum of its proper divisors (30693429360).

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

19961717364 is a wasteful number, since it uses less digits than its factorization.

19961717364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157824 (or 2157819 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The spelling of 19961717364 in words is "nineteen billion, nine hundred sixty-one million, seven hundred seventeen thousand, three hundred sixty-four".