66713511 has 16 divisors (see below), whose sum is σ = 91397504. Its totient is φ = 43261344.

The previous prime is 66713497. The next prime is 66713527. The reversal of 66713511 is 11531766.

It is not a de Polignac number, because 66713511 - 2⁶ = 66713447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66713551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34800 + ... + 36666.

It is an arithmetic number, because the mean of its divisors is an integer number (5712344).

Almost surely, 2^66713511 is an apocalyptic number.

66713511 is a deficient number, since it is larger than the sum of its proper divisors (24683993).

66713511 is a wasteful number, since it uses less digits than its factorization.

66713511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190.

The product of its digits is 3780, while the sum is 30.

The square root of 66713511 is about 8167.8339233851. The cubic root of 66713511 is about 405.5750830349.

The spelling of 66713511 in words is "sixty-six million, seven hundred thirteen thousand, five hundred eleven".