18516356353 has 4 divisors (see below), whose sum is σ = 20199661488. Its totient is φ = 16833051220.

The previous prime is 18516356317. The next prime is 18516356359. The reversal of 18516356353 is 35365361581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18516356353 - 2¹³ = 18516348161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18516356359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841652551 + ... + 841652572.

It is an arithmetic number, because the mean of its divisors is an integer number (5049915372).

Almost surely, 2^18516356353 is an apocalyptic number.

It is an amenable number.

18516356353 is a deficient number, since it is larger than the sum of its proper divisors (1683305135).

18516356353 is a wasteful number, since it uses less digits than its factorization.

18516356353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683305134.

The product of its digits is 972000, while the sum is 46.

The spelling of 18516356353 in words is "eighteen billion, five hundred sixteen million, three hundred fifty-six thousand, three hundred fifty-three".