11997461889 has 48 divisors (see below), whose sum is σ = 20486752000. Its totient is φ = 6761651904.

The previous prime is 11997461881. The next prime is 11997461893. The reversal of 11997461889 is 98816479911.

11997461889 is a `hidden beast` number, since 1 + 1 + 9 + 9 + 7 + 4 + 618 + 8 + 9 = 666.

11997461889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11997461889 - 2³ = 11997461881 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11997461881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 198732 + ... + 251970.

Almost surely, 2^11997461889 is an apocalyptic number.

It is an amenable number.

11997461889 is a deficient number, since it is larger than the sum of its proper divisors (8489290111).

11997461889 is an equidigital number, since it uses as much as digits as its factorization.

11997461889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53339 (or 53322 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 63.

The spelling of 11997461889 in words is "eleven billion, nine hundred ninety-seven million, four hundred sixty-one thousand, eight hundred eighty-nine".