8121790172159 has 24 divisors (see below), whose sum is σ = 8840297581920. Its totient is φ = 7444830224832.

The previous prime is 8121790172147. The next prime is 8121790172183. The reversal of 8121790172159 is 9512710971218.

It is a de Polignac number, because none of the positive numbers 2^k-8121790172159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8121790172159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121790172359) by changing a digit.

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, 452237 + ... + 4055625.

It is an arithmetic number, because the mean of its divisors is an integer number (368345732580).

Almost surely, 2^{8121790172159} is an apocalyptic number.

8121790172159 is a deficient number, since it is larger than the sum of its proper divisors (718507409761).

8121790172159 is a wasteful number, since it uses less digits than its factorization.

8121790172159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603551 (or 3603508 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 53.

The spelling of 8121790172159 in words is "eight trillion, one hundred twenty-one billion, seven hundred ninety million, one hundred seventy-two thousand, one hundred fifty-nine".