18866407549 has 8 divisors (see below), whose sum is σ = 20584240992. Its totient is φ = 17149025040.

The previous prime is 18866407507. The next prime is 18866407601. The reversal of 18866407549 is 94570466881.

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 18866407549 - 2⁷ = 18866407421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18866407493 and 18866407502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18866402549) 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, 22074 + ... + 195499.

It is an arithmetic number, because the mean of its divisors is an integer number (2573030124).

Almost surely, 2^18866407549 is an apocalyptic number.

It is an amenable number.

18866407549 is a deficient number, since it is larger than the sum of its proper divisors (1717833443).

18866407549 is a wasteful number, since it uses less digits than its factorization.

18866407549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225467.

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 18866407549 in words is "eighteen billion, eight hundred sixty-six million, four hundred seven thousand, five hundred forty-nine".