660407018 has 4 divisors (see below), whose sum is σ = 990610530. Its totient is φ = 330203508.

The previous prime is 660407017. The next prime is 660407023. The reversal of 660407018 is 810704066.

660407018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 588208009 + 72199009 = 24253^2 + 8497^2 .

It is a super-2 number, since 2×660407018² = 872274858847304648, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (660407017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165101753 + ... + 165101756.

Almost surely, 2^660407018 is an apocalyptic number.

660407018 is a deficient number, since it is larger than the sum of its proper divisors (330203512).

660407018 is a wasteful number, since it uses less digits than its factorization.

660407018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330203511.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 660407018 is about 25698.3855134909. The cubic root of 660407018 is about 870.8377090008.

The spelling of 660407018 in words is "six hundred sixty million, four hundred seven thousand, eighteen".