18000641768 has 32 divisors (see below), whose sum is σ = 35102321760. Its totient is φ = 8646886080.

The previous prime is 18000641767. The next prime is 18000641773. The reversal of 18000641768 is 86714600081.

It is not an unprimeable number, because it can be changed into a prime (18000641761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407930 + ... + 449897.

It is an arithmetic number, because the mean of its divisors is an integer number (1096947555).

Almost surely, 2^18000641768 is an apocalyptic number.

It is an amenable number.

18000641768 is a deficient number, since it is larger than the sum of its proper divisors (17101679992).

18000641768 is a wasteful number, since it uses less digits than its factorization.

18000641768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857937 (or 857933 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 18000641768 in words is "eighteen billion, six hundred forty-one thousand, seven hundred sixty-eight".