7999171696121 has 8 divisors (see below), whose sum is σ = 8185248080064. Its totient is φ = 7813097545680.

The previous prime is 7999171696097. The next prime is 7999171696183. The reversal of 7999171696121 is 1216961719997.

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 7999171696121 - 2¹⁸ = 7999171433977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7999171696921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8305511 + ... + 9218451.

It is an arithmetic number, because the mean of its divisors is an integer number (1023156010008).

Almost surely, 2^{7999171696121} is an apocalyptic number.

It is an amenable number.

7999171696121 is a deficient number, since it is larger than the sum of its proper divisors (186076383943).

7999171696121 is a wasteful number, since it uses less digits than its factorization.

7999171696121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116751.

The product of its digits is 23147208, while the sum is 68.

The spelling of 7999171696121 in words is "seven trillion, nine hundred ninety-nine billion, one hundred seventy-one million, six hundred ninety-six thousand, one hundred twenty-one".