18665343658 has 8 divisors (see below), whose sum is σ = 30151709028. Its totient is φ = 8614773984.

The previous prime is 18665343607. The next prime is 18665343659. The reversal of 18665343658 is 85634356681.

It can be written as a sum of positive squares in 2 ways, for example, as 16920025929 + 1745317729 = 130077^2 + 41777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×18665343658³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18665343599 and 18665343608.

It is not an unprimeable number, because it can be changed into a prime (18665343659) 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, 358948891 + ... + 358948942.

Almost surely, 2^18665343658 is an apocalyptic number.

18665343658 is a deficient number, since it is larger than the sum of its proper divisors (11486365370).

18665343658 is a wasteful number, since it uses less digits than its factorization.

18665343658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717897848.

The product of its digits is 12441600, while the sum is 55.

The spelling of 18665343658 in words is "eighteen billion, six hundred sixty-five million, three hundred forty-three thousand, six hundred fifty-eight".