66976613 has 8 divisors (see below), whose sum is σ = 73248960. Its totient is φ = 60734880.

The previous prime is 66976603. The next prime is 66976619. The reversal of 66976613 is 31667966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66976613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66976619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2945 + ... + 11942.

It is an arithmetic number, because the mean of its divisors is an integer number (9156120).

Almost surely, 2^66976613 is an apocalyptic number.

It is an amenable number.

66976613 is a deficient number, since it is larger than the sum of its proper divisors (6272347).

66976613 is a wasteful number, since it uses less digits than its factorization.

66976613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15307.

The product of its digits is 244944, while the sum is 44.

The square root of 66976613 is about 8183.9240587874. The cubic root of 66976613 is about 406.1075471194.

It can be divided in two parts, 66 and 976613, that added together give a palindrome (976679).

The spelling of 66976613 in words is "sixty-six million, nine hundred seventy-six thousand, six hundred thirteen".