19972417815187 has 8 divisors (see below), whose sum is σ = 20055039919200. Its totient is φ = 19889846328000.

The previous prime is 19972417815169. The next prime is 19972417815193. The reversal of 19972417815187 is 78151871427991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19972417815187 - 2⁷ = 19972417815059 is a prime.

It is a super-3 number, since 3×19972417815187³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19972417815157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11863312 + ... + 13441837.

It is an arithmetic number, because the mean of its divisors is an integer number (2506879989900).

Almost surely, 2^{19972417815187} is an apocalyptic number.

19972417815187 is a deficient number, since it is larger than the sum of its proper divisors (82622104013).

19972417815187 is a wasteful number, since it uses less digits than its factorization.

19972417815187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25308413.

The product of its digits is 71124480, while the sum is 70.

The spelling of 19972417815187 in words is "nineteen trillion, nine hundred seventy-two billion, four hundred seventeen million, eight hundred fifteen thousand, one hundred eighty-seven".