18668428328351 has 4 divisors (see below), whose sum is σ = 18741068127552. Its totient is φ = 18595788529152.

The previous prime is 18668428328153. The next prime is 18668428328377. The reversal of 18668428328351 is 15382382486681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18668428328351 - 2³⁴ = 18651248459167 is a prime.

It is a super-2 number, since 2×18668428328351² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18668428328951) 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, 36319899215 + ... + 36319899728.

It is an arithmetic number, because the mean of its divisors is an integer number (4685267031888).

Almost surely, 2^{18668428328351} is an apocalyptic number.

18668428328351 is a deficient number, since it is larger than the sum of its proper divisors (72639799201).

18668428328351 is an equidigital number, since it uses as much as digits as its factorization.

18668428328351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72639799200.

The product of its digits is 106168320, while the sum is 65.

The spelling of 18668428328351 in words is "eighteen trillion, six hundred sixty-eight billion, four hundred twenty-eight million, three hundred twenty-eight thousand, three hundred fifty-one".