11199999961 has 4 divisors (see below), whose sum is σ = 11353424692. Its totient is φ = 11046575232.

The previous prime is 11199999953. The next prime is 11200000043. The reversal of 11199999961 is 16999999111.

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 5350044736 + 5849955225 = 73144^2 + 76485^2 .

It is a cyclic number.

It is not a de Polignac number, because 11199999961 - 2³ = 11199999953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11199999893 and 11199999902.

It is not an unprimeable number, because it can be changed into a prime (11199999911) 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, 76712256 + ... + 76712401.

It is an arithmetic number, because the mean of its divisors is an integer number (2838356173).

Almost surely, 2^11199999961 is an apocalyptic number.

It is an amenable number.

11199999961 is a deficient number, since it is larger than the sum of its proper divisors (153424731).

11199999961 is an equidigital number, since it uses as much as digits as its factorization.

11199999961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153424730.

The product of its digits is 3188646, while the sum is 64.

The spelling of 11199999961 in words is "eleven billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred sixty-one".