18553343945 has 16 divisors (see below), whose sum is σ = 23070178560. Its totient is φ = 14313970944.

The previous prime is 18553343933. The next prime is 18553343947. The reversal of 18553343945 is 54934335581.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18553343945 - 2⁶ = 18553343881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18553343893 and 18553343902.

It is not an unprimeable number, because it can be changed into a prime (18553343947) 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 15 ways as a sum of consecutive naturals, for example, 529184 + ... + 563153.

It is an arithmetic number, because the mean of its divisors is an integer number (1441886160).

Almost surely, 2^18553343945 is an apocalyptic number.

It is an amenable number.

18553343945 is a deficient number, since it is larger than the sum of its proper divisors (4516834615).

18553343945 is a wasteful number, since it uses less digits than its factorization.

18553343945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092464.

The product of its digits is 3888000, while the sum is 50.

The spelling of 18553343945 in words is "eighteen billion, five hundred fifty-three million, three hundred forty-three thousand, nine hundred forty-five".