18571577678545 has 16 divisors (see below), whose sum is σ = 22949419331520. Its totient is φ = 14419312899264.

The previous prime is 18571577678503. The next prime is 18571577678597. The reversal of 18571577678545 is 54587677517581.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18571577678545 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 275059975 + ... + 275127484.

It is an arithmetic number, because the mean of its divisors is an integer number (1434338708220).

Almost surely, 2^{18571577678545} is an apocalyptic number.

It is an amenable number.

18571577678545 is a deficient number, since it is larger than the sum of its proper divisors (4377841652975).

18571577678545 is a wasteful number, since it uses less digits than its factorization.

18571577678545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550187664.

The product of its digits is 2304960000, while the sum is 76.

The spelling of 18571577678545 in words is "eighteen trillion, five hundred seventy-one billion, five hundred seventy-seven million, six hundred seventy-eight thousand, five hundred forty-five".