18364558649566 has 16 divisors (see below), whose sum is σ = 27611984640240. Its totient is φ = 9160585156800.

The previous prime is 18364558649531. The next prime is 18364558649627. The reversal of 18364558649566 is 66594685546381.

It is a junction number, because it is equal to n+sod(n) for n = 18364558649492 and 18364558649501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3628156 + ... + 7063471.

It is an arithmetic number, because the mean of its divisors is an integer number (1725749040015).

Almost surely, 2^{18364558649566} is an apocalyptic number.

18364558649566 is a deficient number, since it is larger than the sum of its proper divisors (9247425990674).

18364558649566 is a wasteful number, since it uses less digits than its factorization.

18364558649566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10693659.

The product of its digits is 4478976000, while the sum is 76.

The spelling of 18364558649566 in words is "eighteen trillion, three hundred sixty-four billion, five hundred fifty-eight million, six hundred forty-nine thousand, five hundred sixty-six".