66760213 has 4 divisors (see below), whose sum is σ = 71895628. Its totient is φ = 61624800.

The previous prime is 66760159. The next prime is 66760219. The reversal of 66760213 is 31206766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31206766 = 2 ⋅15603383.

It can be written as a sum of positive squares in 2 ways, for example, as 33663204 + 33097009 = 5802^2 + 5753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66760213 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 (66760219) 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, 2567688 + ... + 2567713.

It is an arithmetic number, because the mean of its divisors is an integer number (17973907).

Almost surely, 2^66760213 is an apocalyptic number.

It is an amenable number.

66760213 is a deficient number, since it is larger than the sum of its proper divisors (5135415).

66760213 is a wasteful number, since it uses less digits than its factorization.

66760213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135414.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66760213 is about 8170.6923207278. The cubic root of 66760213 is about 405.6697002977.

Adding to 66760213 its reverse (31206766), we get a palindrome (97966979).

The spelling of 66760213 in words is "sixty-six million, seven hundred sixty thousand, two hundred thirteen".