11806720549 has 8 divisors (see below), whose sum is σ = 12744300632. Its totient is φ = 10873336320.

The previous prime is 11806720531. The next prime is 11806720567. The reversal of 11806720549 is 94502760811.

It is an interprime number because it is at equal distance from previous prime (11806720531) and next prime (11806720567).

It can be written as a sum of positive squares in 4 ways, for example, as 8850625 + 11797869924 = 2975^2 + 108618^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11806720549 - 2²⁵ = 11773166117 is a prime.

It is a super-2 number, since 2×11806720549² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11806720529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1043112 + ... + 1054369.

It is an arithmetic number, because the mean of its divisors is an integer number (1593037579).

Almost surely, 2^11806720549 is an apocalyptic number.

It is an amenable number.

11806720549 is a deficient number, since it is larger than the sum of its proper divisors (937580083).

11806720549 is a wasteful number, since it uses less digits than its factorization.

11806720549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097927.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 11806720549 in words is "eleven billion, eight hundred six million, seven hundred twenty thousand, five hundred forty-nine".