66686862 has 16 divisors (see below), whose sum is σ = 145498752. Its totient is φ = 20208120.

The previous prime is 66686791. The next prime is 66686891. The reversal of 66686862 is 26868666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505138 + ... + 505269.

It is an arithmetic number, because the mean of its divisors is an integer number (9093672).

Almost surely, 2^66686862 is an apocalyptic number.

66686862 is an abundant number, since it is smaller than the sum of its proper divisors (78811890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66686862 is a wasteful number, since it uses less digits than its factorization.

66686862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010423.

The product of its digits is 995328, while the sum is 48.

The square root of 66686862 is about 8166.2024221789. The cubic root of 66686862 is about 405.5210729368.

It can be divided in two parts, 6668 and 6862, that added together give a triangular number (13530 = T₁₆₄).

The spelling of 66686862 in words is "sixty-six million, six hundred eighty-six thousand, eight hundred sixty-two".