18806247677549 has 16 divisors (see below), whose sum is σ = 18939680672640. Its totient is φ = 18673043866560.

The previous prime is 18806247677543. The next prime is 18806247677561. The reversal of 18806247677549 is 94577674260881.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18806247677549 - 2⁴ = 18806247677533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18806247677543) 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, 812037632 + ... + 812060790.

It is an arithmetic number, because the mean of its divisors is an integer number (1183730042040).

Almost surely, 2^{18806247677549} is an apocalyptic number.

It is an amenable number.

18806247677549 is a deficient number, since it is larger than the sum of its proper divisors (133432995091).

18806247677549 is a wasteful number, since it uses less digits than its factorization.

18806247677549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27860.

The product of its (nonzero) digits is 1137991680, while the sum is 74.

The spelling of 18806247677549 in words is "eighteen trillion, eight hundred six billion, two hundred forty-seven million, six hundred seventy-seven thousand, five hundred forty-nine".