19965213015606 has 48 divisors (see below), whose sum is σ = 43596455945328. Its totient is φ = 6603014246400.

The previous prime is 19965213015593. The next prime is 19965213015667. The reversal of 19965213015606 is 60651031256991.

19965213015606 is a `hidden beast` number, since 1 + 9 + 9 + 6 + 5 + 2 + 13 + 0 + 15 + 606 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11650950 + ... + 13254246.

It is an arithmetic number, because the mean of its divisors is an integer number (908259498861).

Almost surely, 2^{19965213015606} is an apocalyptic number.

19965213015606 is an abundant number, since it is smaller than the sum of its proper divisors (23631242929722).

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

19965213015606 is a wasteful number, since it uses less digits than its factorization.

19965213015606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608717 (or 1608714 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The spelling of 19965213015606 in words is "nineteen trillion, nine hundred sixty-five billion, two hundred thirteen million, fifteen thousand, six hundred six".