11989553897 has 16 divisors (see below), whose sum is σ = 12473455680. Its totient is φ = 11510520000.

The previous prime is 11989553881. The next prime is 11989553899. The reversal of 11989553897 is 79835598911.

It is a cyclic number.

It is not a de Polignac number, because 11989553897 - 2⁴ = 11989553881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11989553899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6208022 + ... + 6209952.

It is an arithmetic number, because the mean of its divisors is an integer number (779590980).

Almost surely, 2^11989553897 is an apocalyptic number.

It is an amenable number.

11989553897 is a deficient number, since it is larger than the sum of its proper divisors (483901783).

11989553897 is a wasteful number, since it uses less digits than its factorization.

11989553897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064.

The product of its digits is 24494400, while the sum is 65.

The spelling of 11989553897 in words is "eleven billion, nine hundred eighty-nine million, five hundred fifty-three thousand, eight hundred ninety-seven".