11156445497 has 4 divisors (see below), whose sum is σ = 11157454836. Its totient is φ = 11155436160.

The previous prime is 11156445457. The next prime is 11156445563. The reversal of 11156445497 is 79454465111.

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 7164606736 + 3991838761 = 84644^2 + 63181^2 .

It is a cyclic number.

It is not a de Polignac number, because 11156445497 - 2²² = 11152251193 is a prime.

It is a super-2 number, since 2×11156445497² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11156445427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487904 + ... + 510257.

It is an arithmetic number, because the mean of its divisors is an integer number (2789363709).

Almost surely, 2^11156445497 is an apocalyptic number.

It is an amenable number.

11156445497 is a deficient number, since it is larger than the sum of its proper divisors (1009339).

11156445497 is an equidigital number, since it uses as much as digits as its factorization.

11156445497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009338.

The product of its digits is 604800, while the sum is 47.

The spelling of 11156445497 in words is "eleven billion, one hundred fifty-six million, four hundred forty-five thousand, four hundred ninety-seven".