18520368367 has 4 divisors (see below), whose sum is σ = 18521006680. Its totient is φ = 18519730056.

The previous prime is 18520368353. The next prime is 18520368371. The reversal of 18520368367 is 76386302581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76386302581 = 1069 ⋅71455849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18520368367 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18520368367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520368767) 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, 273453 + ... + 334390.

It is an arithmetic number, because the mean of its divisors is an integer number (4630251670).

Almost surely, 2^18520368367 is an apocalyptic number.

18520368367 is a deficient number, since it is larger than the sum of its proper divisors (638313).

18520368367 is an equidigital number, since it uses as much as digits as its factorization.

18520368367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638312.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 18520368367 in words is "eighteen billion, five hundred twenty million, three hundred sixty-eight thousand, three hundred sixty-seven".