11997822546 has 40 divisors (see below), whose sum is σ = 26890541964. Its totient is φ = 3998302560.

The previous prime is 11997822521. The next prime is 11997822559. The reversal of 11997822546 is 64522879911.

It is a happy number.

11997822546 is a `hidden beast` number, since 1 + 1 + 9 + 9 + 78 + 22 + 546 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11927916225 + 69906321 = 109215^2 + 8361^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 11997822492 and 11997822501.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1026616 + ... + 1038236.

Almost surely, 2^11997822546 is an apocalyptic number.

11997822546 is an abundant number, since it is smaller than the sum of its proper divisors (14892719418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11997822546 is a wasteful number, since it uses less digits than its factorization.

11997822546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18008 (or 17999 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 11997822546 in words is "eleven billion, nine hundred ninety-seven million, eight hundred twenty-two thousand, five hundred forty-six".