66912685 has 12 divisors (see below), whose sum is σ = 93404988. Its totient is φ = 45882816.

The previous prime is 66912679. The next prime is 66912701. The reversal of 66912685 is 58621966.

It can be written as a sum of positive squares in 2 ways, for example, as 30503529 + 36409156 = 5523^2 + 6034^2 .

It is not a de Polignac number, because 66912685 - 2⁵ = 66912653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136312 + ... + 136801.

It is an arithmetic number, because the mean of its divisors is an integer number (7783749).

Almost surely, 2^66912685 is an apocalyptic number.

It is an amenable number.

66912685 is a deficient number, since it is larger than the sum of its proper divisors (26492303).

66912685 is a wasteful number, since it uses less digits than its factorization.

66912685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273132 (or 273125 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 66912685 is about 8180.0174205193. The cubic root of 66912685 is about 405.9782984833.

The spelling of 66912685 in words is "sixty-six million, nine hundred twelve thousand, six hundred eighty-five".