18220673968546 has 24 divisors (see below), whose sum is σ = 31794691269996. Its totient is φ = 7808498127360.

The previous prime is 18220673968537. The next prime is 18220673968597. The reversal of 18220673968546 is 64586937602281.

It can be written as a sum of positive squares in 2 ways, for example, as 17501212068025 + 719461900521 = 4183445^2 + 848211^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2181975 + ... + 6418906.

It is a 1-persistent number, because it is pandigital, but 2⋅18220673968546 = 36441347937092 is not.

Almost surely, 2^{18220673968546} is an apocalyptic number.

18220673968546 is a deficient number, since it is larger than the sum of its proper divisors (13574017301450).

18220673968546 is a wasteful number, since it uses less digits than its factorization.

18220673968546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8622514 (or 8622507 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 67.

The spelling of 18220673968546 in words is "eighteen trillion, two hundred twenty billion, six hundred seventy-three million, nine hundred sixty-eight thousand, five hundred forty-six".