11989204026849 has 405 divisors, whose sum is σ = 22932758139291. Its totient is φ = 6222605276160.

The previous prime is 11989204026829. The next prime is 11989204026859. The reversal of 11989204026849 is 94862040298911.

The square root of 11989204026849 is 3462543.

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

11989204026849 is a `hidden beast` number, since 11 + 98 + 92 + 0 + 402 + 6 + 8 + 49 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 6947742124449 + 5041461902400 = 2635857^2 + 2245320^2 .

It is not a de Polignac number, because 11989204026849 - 2²³ = 11989195638241 is a prime.

It is a super-2 number, since 2×11989204026849² (a number of 27 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (11989204026829) by changing a digit.

It is a polite number, since it can be written in 404 ways as a sum of consecutive naturals, for example, 196544328279 + ... + 196544328339.

Almost surely, 2^{11989204026849} is an apocalyptic number.

11989204026849 is the 3462543-rd square number.

11989204026849 is the 1731272-nd centered octagonal number.

It is an amenable number.

11989204026849 is a deficient number, since it is larger than the sum of its proper divisors (10943554112442).

11989204026849 is an frugal number, since it uses more digits than its factorization.

11989204026849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 63.

The spelling of 11989204026849 in words is "eleven trillion, nine hundred eighty-nine billion, two hundred four million, twenty-six thousand, eight hundred forty-nine".