18115245549 has 6 divisors (see below), whose sum is σ = 26166465806. Its totient is φ = 12076830360.

The previous prime is 18115245541. The next prime is 18115245569. The reversal of 18115245549 is 94554251181.

18115245549 is a `hidden beast` number, since 1 + 8 + 1 + 152 + 455 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15570547524 + 2544698025 = 124782^2 + 50445^2 .

It is not a de Polignac number, because 18115245549 - 2³ = 18115245541 is a prime.

It is a super-2 number, since 2×18115245549² (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 (18115245541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1006402522 + ... + 1006402539.

Almost surely, 2^18115245549 is an apocalyptic number.

It is an amenable number.

18115245549 is a deficient number, since it is larger than the sum of its proper divisors (8051220257).

18115245549 is a wasteful number, since it uses less digits than its factorization.

18115245549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012805067 (or 2012805064 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The spelling of 18115245549 in words is "eighteen billion, one hundred fifteen million, two hundred forty-five thousand, five hundred forty-nine".