66686855074 has 32 divisors (see below), whose sum is σ = 118130112000. Its totient is φ = 28218284640.

The previous prime is 66686855071. The next prime is 66686855107. The reversal of 66686855074 is 47055868666.

It is not an unprimeable number, because it can be changed into a prime (66686855071) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 561067 + ... + 669454.

It is an arithmetic number, because the mean of its divisors is an integer number (3691566000).

Almost surely, 2^66686855074 is an apocalyptic number.

66686855074 is a deficient number, since it is larger than the sum of its proper divisors (51443256926).

66686855074 is a wasteful number, since it uses less digits than its factorization.

66686855074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230623 (or 1230609 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 61.

The spelling of 66686855074 in words is "sixty-six billion, six hundred eighty-six million, eight hundred fifty-five thousand, seventy-four".