66698685 has 12 divisors (see below), whose sum is σ = 115611132. Its totient is φ = 35572608.

The previous prime is 66698669. The next prime is 66698699. The reversal of 66698685 is 58689666.

It can be written as a sum of positive squares in 2 ways, for example, as 24980004 + 41718681 = 4998^2 + 6459^2 .

It is not a de Polignac number, because 66698685 - 2⁴ = 66698669 is a prime.

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, 741052 + ... + 741141.

It is an arithmetic number, because the mean of its divisors is an integer number (9634261).

Almost surely, 2^66698685 is an apocalyptic number.

It is an amenable number.

66698685 is a deficient number, since it is larger than the sum of its proper divisors (48912447).

66698685 is a wasteful number, since it uses less digits than its factorization.

66698685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482204 (or 1482201 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 66698685 is about 8166.9262883903. The cubic root of 66698685 is about 405.5450366391.

The spelling of 66698685 in words is "sixty-six million, six hundred ninety-eight thousand, six hundred eighty-five".