66418444287 has 64 divisors (see below), whose sum is σ = 112324786560. Its totient is φ = 38425853952.

The previous prime is 66418444273. The next prime is 66418444357. The reversal of 66418444287 is 78244481466.

66418444287 is a `hidden beast` number, since 6 + 6 + 41 + 84 + 442 + 87 = 666.

It is not a de Polignac number, because 66418444287 - 2⁷ = 66418444159 is a prime.

It is a super-2 number, since 2×66418444287² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66418444217) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5824063 + ... + 5835455.

It is an arithmetic number, because the mean of its divisors is an integer number (1755074790).

Almost surely, 2^66418444287 is an apocalyptic number.

66418444287 is a deficient number, since it is larger than the sum of its proper divisors (45906342273).

66418444287 is a wasteful number, since it uses less digits than its factorization.

66418444287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12409 (or 12403 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 54.

The spelling of 66418444287 in words is "sixty-six billion, four hundred eighteen million, four hundred forty-four thousand, two hundred eighty-seven".