9815999730201 has 32 divisors (see below), whose sum is σ = 16653530880000. Its totient is φ = 5597718734160.

The previous prime is 9815999730191. The next prime is 9815999730209. The reversal of 9815999730201 is 1020379995189.

9815999730201 is a `hidden beast` number, since 9 + 8 + 1 + 599 + 9 + 7 + 30 + 2 + 0 + 1 = 666.

It is not a de Polignac number, because 9815999730201 - 2²³ = 9815991341593 is a prime.

It is a super-2 number, since 2×9815999730201² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (9815999730209) 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 31 ways as a sum of consecutive naturals, for example, 52795701 + ... + 52981298.

It is an arithmetic number, because the mean of its divisors is an integer number (520422840000).

Almost surely, 2^{9815999730201} is an apocalyptic number.

It is an amenable number.

9815999730201 is a deficient number, since it is larger than the sum of its proper divisors (6837531149799).

9815999730201 is a wasteful number, since it uses less digits than its factorization.

9815999730201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105777506 (or 105777500 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 63.

The spelling of 9815999730201 in words is "nine trillion, eight hundred fifteen billion, nine hundred ninety-nine million, seven hundred thirty thousand, two hundred one".