66713766 has 16 divisors (see below), whose sum is σ = 152488704. Its totient is φ = 19061064.

The previous prime is 66713741. The next prime is 66713819. The reversal of 66713766 is 66731766.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1588423 = 66713766 / (6 + 6 + 7 + 1 + 3 + 7 + 6 + 6).

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

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, 794170 + ... + 794253.

It is an arithmetic number, because the mean of its divisors is an integer number (9530544).

Almost surely, 2^66713766 is an apocalyptic number.

66713766 is an abundant number, since it is smaller than the sum of its proper divisors (85774938).

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

66713766 is a wasteful number, since it uses less digits than its factorization.

66713766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588435.

The product of its digits is 190512, while the sum is 42.

The square root of 66713766 is about 8167.8495333839. The cubic root of 66713766 is about 405.5755997794.

The spelling of 66713766 in words is "sixty-six million, seven hundred thirteen thousand, seven hundred sixty-six".