18351936666 has 64 divisors (see below), whose sum is σ = 47398118400. Its totient is φ = 5154532848.

The previous prime is 18351936661. The next prime is 18351936719. The reversal of 18351936666 is 66663915381.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18351936661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389140 + ... + 433743.

It is an arithmetic number, because the mean of its divisors is an integer number (740595600).

Almost surely, 2^18351936666 is an apocalyptic number.

18351936666 is an abundant number, since it is smaller than the sum of its proper divisors (29046181734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18351936666 is a wasteful number, since it uses less digits than its factorization.

18351936666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822960 (or 822954 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The spelling of 18351936666 in words is "eighteen billion, three hundred fifty-one million, nine hundred thirty-six thousand, six hundred sixty-six".