18368985658 has 4 divisors (see below), whose sum is σ = 27553478490. Its totient is φ = 9184492828.

The previous prime is 18368985653. The next prime is 18368985683. The reversal of 18368985658 is 85658986381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85658986381 = 55399 ⋅1546219.

It can be written as a sum of positive squares in only one way, i.e., 17336198889 + 1032786769 = 131667^2 + 32137^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18368985593 and 18368985602.

It is not an unprimeable number, because it can be changed into a prime (18368985653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4592246413 + ... + 4592246416.

Almost surely, 2^18368985658 is an apocalyptic number.

18368985658 is a deficient number, since it is larger than the sum of its proper divisors (9184492832).

18368985658 is an equidigital number, since it uses as much as digits as its factorization.

18368985658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9184492831.

The product of its digits is 99532800, while the sum is 67.

The spelling of 18368985658 in words is "eighteen billion, three hundred sixty-eight million, nine hundred eighty-five thousand, six hundred fifty-eight".