19650686131984 has 10 divisors (see below), whose sum is σ = 38073204380750. Its totient is φ = 9825343065984.

The previous prime is 19650686131913. The next prime is 19650686132041. The reversal of 19650686131984 is 48913168605691.

It can be written as a sum of positive squares in only one way, i.e., 14516709606400 + 5133976525584 = 3810080^2 + 2265828^2 .

It is a super-2 number, since 2×19650686131984² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614083941609 + ... + 614083941640.

It is an arithmetic number, because the mean of its divisors is an integer number (3807320438075).

Almost surely, 2^{19650686131984} is an apocalyptic number.

It is an amenable number.

19650686131984 is a deficient number, since it is larger than the sum of its proper divisors (18422518248766).

19650686131984 is a wasteful number, since it uses less digits than its factorization.

19650686131984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228167883257 (or 1228167883251 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 67.

The spelling of 19650686131984 in words is "nineteen trillion, six hundred fifty billion, six hundred eighty-six million, one hundred thirty-one thousand, nine hundred eighty-four".