999996867271405 has 32 divisors (see below), whose sum is σ = 1229557829410944. Its totient is φ = 780339965481216.

The previous prime is 999996867271403. The next prime is 999996867271459. The reversal of 999996867271405 is 504172768699999.

999996867271405 is a nontrivial binomial coefficient, being equal to C(44721290, 2).

It is a cyclic number.

It is not a de Polignac number, because 999996867271405 - 2¹ = 999996867271403 is a prime.

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 999996867271405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999996867271403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9615025134 + ... + 9615129136.

It is an arithmetic number, because the mean of its divisors is an integer number (38423682169092).

Almost surely, 2^{999996867271405} is an apocalyptic number.

999996867271405 is the 44721289-th triangular number and also the 22360645-th hexagonal number.

999996867271405 is the 14907097-th centered nonagonal number.

It is an amenable number.

999996867271405 is a deficient number, since it is larger than the sum of its proper divisors (229560962139539).

999996867271405 is a wasteful number, since it uses less digits than its factorization.

999996867271405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163885.

The product of its (nonzero) digits is 33331979520, while the sum is 91.

The spelling of 999996867271405 in words is "nine hundred ninety-nine trillion, nine hundred ninety-six billion, eight hundred sixty-seven million, two hundred seventy-one thousand, four hundred five".