18473856646 has 16 divisors (see below), whose sum is σ = 31671641376. Its totient is φ = 7916823936.

The previous prime is 18473856563. The next prime is 18473856697. The reversal of 18473856646 is 64665837481.

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, 219460 + ... + 291736.

It is an arithmetic number, because the mean of its divisors is an integer number (1979477586).

Almost surely, 2^18473856646 is an apocalyptic number.

18473856646 is a deficient number, since it is larger than the sum of its proper divisors (13197784730).

18473856646 is a wasteful number, since it uses less digits than its factorization.

18473856646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90543.

The product of its digits is 23224320, while the sum is 58.

The spelling of 18473856646 in words is "eighteen billion, four hundred seventy-three million, eight hundred fifty-six thousand, six hundred forty-six".