7899122112001 has 8 divisors (see below), whose sum is σ = 7920241828200. Its totient is φ = 7878006568320.

The previous prime is 7899122111983. The next prime is 7899122112031. The reversal of 7899122112001 is 1002112219987.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 171250302976 + 7727871809025 = 413824^2 + 2779905^2 .

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 7899122112001 - 2²⁹ = 7898585241089 is a prime.

It is a super-2 number, since 2×7899122112001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7899122112031) 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, 2766765 + ... + 4842853.

It is an arithmetic number, because the mean of its divisors is an integer number (990030228525).

Almost surely, 2^{7899122112001} is an apocalyptic number.

It is an amenable number.

7899122112001 is a deficient number, since it is larger than the sum of its proper divisors (21119716199).

7899122112001 is a wasteful number, since it uses less digits than its factorization.

7899122112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086259.

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 7899122112001 in words is "seven trillion, eight hundred ninety-nine billion, one hundred twenty-two million, one hundred twelve thousand, one".