9902726418385 has 4 divisors (see below), whose sum is σ = 11883271702068. Its totient is φ = 7922181134704.

The previous prime is 9902726418383. The next prime is 9902726418407. The reversal of 9902726418385 is 5838146272099.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3176297435089 + 6726428983296 = 1782217^2 + 2593536^2 .

It is a cyclic number.

It is not a de Polignac number, because 9902726418385 - 2¹ = 9902726418383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9902726418383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990272641834 + ... + 990272641843.

It is an arithmetic number, because the mean of its divisors is an integer number (2970817925517).

It is a 2-persistent number, because it is pandigital, and so is 2⋅9902726418385 = 19805452836770, but 3⋅9902726418385 = 29708179255155 is not.

Almost surely, 2^{9902726418385} is an apocalyptic number.

It is an amenable number.

9902726418385 is a deficient number, since it is larger than the sum of its proper divisors (1980545283683).

9902726418385 is a wasteful number, since it uses less digits than its factorization.

9902726418385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980545283682.

The product of its (nonzero) digits is 52254720, while the sum is 64.

The spelling of 9902726418385 in words is "nine trillion, nine hundred two billion, seven hundred twenty-six million, four hundred eighteen thousand, three hundred eighty-five".