18687268465 has 4 divisors (see below), whose sum is σ = 22424722164. Its totient is φ = 14949814768.

The previous prime is 18687268427. The next prime is 18687268469. The reversal of 18687268465 is 56486278681.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9784968561 + 8902299904 = 98919^2 + 94352^2 .

It is a cyclic number.

It is not a de Polignac number, because 18687268465 - 2⁷ = 18687268337 is a prime.

It is a super-3 number, since 3×18687268465³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18687268469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1868726842 + ... + 1868726851.

It is an arithmetic number, because the mean of its divisors is an integer number (5606180541).

Almost surely, 2^18687268465 is an apocalyptic number.

It is an amenable number.

18687268465 is a deficient number, since it is larger than the sum of its proper divisors (3737453699).

18687268465 is an equidigital number, since it uses as much as digits as its factorization.

18687268465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3737453698.

The product of its digits is 30965760, while the sum is 61.

The spelling of 18687268465 in words is "eighteen billion, six hundred eighty-seven million, two hundred sixty-eight thousand, four hundred sixty-five".