66764311 has 4 divisors (see below), whose sum is σ = 67174072. Its totient is φ = 66354552.

The previous prime is 66764303. The next prime is 66764323. The reversal of 66764311 is 11346766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11346766 = 2 ⋅5673383.

It is a cyclic number.

It is not a de Polignac number, because 66764311 - 2³ = 66764303 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 (66764371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204636 + ... + 204961.

It is an arithmetic number, because the mean of its divisors is an integer number (16793518).

Almost surely, 2^66764311 is an apocalyptic number.

66764311 is a deficient number, since it is larger than the sum of its proper divisors (409761).

66764311 is a wasteful number, since it uses less digits than its factorization.

66764311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409760.

The product of its digits is 18144, while the sum is 34.

The square root of 66764311 is about 8170.9430912227. The cubic root of 66764311 is about 405.6780006527.

The spelling of 66764311 in words is "sixty-six million, seven hundred sixty-four thousand, three hundred eleven".