11163721061 has 4 divisors (see below), whose sum is σ = 11174919372. Its totient is φ = 11152522752.

The previous prime is 11163721057. The next prime is 11163721069. The reversal of 11163721061 is 16012736111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16012736111 = 47 ⋅340696513.

It can be written as a sum of positive squares in 2 ways, for example, as 6908768161 + 4254952900 = 83119^2 + 65230^2 .

It is a cyclic number.

It is not a de Polignac number, because 11163721061 - 2² = 11163721057 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11163721069) 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, 5597660 + ... + 5599653.

It is an arithmetic number, because the mean of its divisors is an integer number (2793729843).

Almost surely, 2^11163721061 is an apocalyptic number.

It is an amenable number.

11163721061 is a deficient number, since it is larger than the sum of its proper divisors (11198311).

11163721061 is an equidigital number, since it uses as much as digits as its factorization.

11163721061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11198310.

The product of its (nonzero) digits is 1512, while the sum is 29.

The spelling of 11163721061 in words is "eleven billion, one hundred sixty-three million, seven hundred twenty-one thousand, sixty-one".