18396686887201 has 4 divisors (see below), whose sum is σ = 21024785013952. Its totient is φ = 15768588760452.

The previous prime is 18396686887153. The next prime is 18396686887211. The reversal of 18396686887201 is 10278868669381.

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 18396686887201 - 2⁹ = 18396686886689 is a prime.

It is a super-2 number, since 2×18396686887201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18396686887211) 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, 1314049063365 + ... + 1314049063378.

It is an arithmetic number, because the mean of its divisors is an integer number (5256196253488).

Almost surely, 2^{18396686887201} is an apocalyptic number.

It is an amenable number.

18396686887201 is a deficient number, since it is larger than the sum of its proper divisors (2628098126751).

18396686887201 is an equidigital number, since it uses as much as digits as its factorization.

18396686887201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628098126750.

The product of its (nonzero) digits is 334430208, while the sum is 73.

The spelling of 18396686887201 in words is "eighteen trillion, three hundred ninety-six billion, six hundred eighty-six million, eight hundred eighty-seven thousand, two hundred one".