19931724886985 has 16 divisors (see below), whose sum is σ = 24257016749952. Its totient is φ = 15719453702400.

The previous prime is 19931724886979. The next prime is 19931724887111. The reversal of 19931724886985 is 58968842713991.

It is not a de Polignac number, because 19931724886985 - 2²⁶ = 19931657778121 is a prime.

It is a super-2 number, since 2×19931724886985² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1771457 + ... + 6557553.

It is an arithmetic number, because the mean of its divisors is an integer number (1516063546872).

Almost surely, 2^{19931724886985} is an apocalyptic number.

It is an amenable number.

19931724886985 is a deficient number, since it is larger than the sum of its proper divisors (4325291862967).

19931724886985 is a wasteful number, since it uses less digits than its factorization.

19931724886985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4797904.

The product of its digits is 1881169920, while the sum is 80.

The spelling of 19931724886985 in words is "nineteen trillion, nine hundred thirty-one billion, seven hundred twenty-four million, eight hundred eighty-six thousand, nine hundred eighty-five".