18255492909 has 32 divisors (see below), whose sum is σ = 28267238400. Its totient is φ = 11622132720.

The previous prime is 18255492889. The next prime is 18255492919. The reversal of 18255492909 is 90929455281.

18255492909 is a `hidden beast` number, since 1 + 8 + 2 + 5 + 549 + 2 + 90 + 9 = 666.

It is not a de Polignac number, because 18255492909 - 2⁹ = 18255492397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18255492919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 360654 + ... + 408144.

It is an arithmetic number, because the mean of its divisors is an integer number (883351200).

Almost surely, 2^18255492909 is an apocalyptic number.

It is an amenable number.

18255492909 is a deficient number, since it is larger than the sum of its proper divisors (10011745491).

18255492909 is a wasteful number, since it uses less digits than its factorization.

18255492909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48142 (or 48136 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 18255492909 in words is "eighteen billion, two hundred fifty-five million, four hundred ninety-two thousand, nine hundred nine".