66018642868 has 12 divisors (see below), whose sum is σ = 118219430560. Its totient is φ = 32241662712.

The previous prime is 66018642857. The next prime is 66018642889. The reversal of 66018642868 is 86824681066.

It is a super-2 number, since 2×66018642868² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191914488 + ... + 191914831.

Almost surely, 2^66018642868 is an apocalyptic number.

It is an amenable number.

66018642868 is a deficient number, since it is larger than the sum of its proper divisors (52200787692).

66018642868 is a wasteful number, since it uses less digits than its factorization.

66018642868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383829366 (or 383829364 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 55.

The spelling of 66018642868 in words is "sixty-six billion, eighteen million, six hundred forty-two thousand, eight hundred sixty-eight".