66018407 has 16 divisors (see below), whose sum is σ = 85532160. Its totient is φ = 49483872.

The previous prime is 66018377. The next prime is 66018451. The reversal of 66018407 is 70481066.

It is a cyclic number.

It is not a de Polignac number, because 66018407 - 2¹⁸ = 65756263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66018457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17363 + ... + 20820.

It is an arithmetic number, because the mean of its divisors is an integer number (5345760).

Almost surely, 2^66018407 is an apocalyptic number.

66018407 is a deficient number, since it is larger than the sum of its proper divisors (19513753).

66018407 is a wasteful number, since it uses less digits than its factorization.

66018407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38222.

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

The square root of 66018407 is about 8125.1711981964. The cubic root of 66018407 is about 404.1615678151.

The spelling of 66018407 in words is "sixty-six million, eighteen thousand, four hundred seven".