11989155025 has 27 divisors (see below), whose sum is σ = 15156479793. Its totient is φ = 9407810400.

The previous prime is 11989155001. The next prime is 11989155043. The reversal of 11989155025 is 52055198911.

The square root of 11989155025 is 109495.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 5522421969 + 6466733056 = 74313^2 + 80416^2 .

It is not a de Polignac number, because 11989155025 - 2⁷ = 11989154897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 33395796 + ... + 33396154.

Almost surely, 2^11989155025 is an apocalyptic number.

11989155025 is the 109495-th square number.

11989155025 is the 54748-th centered octagonal number.

It is an amenable number.

11989155025 is a deficient number, since it is larger than the sum of its proper divisors (3167324768).

11989155025 is an frugal number, since it uses more digits than its factorization.

11989155025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 46.

The spelling of 11989155025 in words is "eleven billion, nine hundred eighty-nine million, one hundred fifty-five thousand, twenty-five".