66980613 has 8 divisors (see below), whose sum is σ = 102065728. Its totient is φ = 38274624.

The previous prime is 66980603. The next prime is 66980621. The reversal of 66980613 is 31608966.

It is a happy number.

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

It is not a de Polignac number, because 66980613 - 2⁵ = 66980581 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 (66980603) 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, 1594756 + ... + 1594797.

It is an arithmetic number, because the mean of its divisors is an integer number (12758216).

Almost surely, 2^66980613 is an apocalyptic number.

It is an amenable number.

66980613 is a deficient number, since it is larger than the sum of its proper divisors (35085115).

66980613 is a wasteful number, since it uses less digits than its factorization.

66980613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189563.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 66980613 is about 8184.1684366831. The cubic root of 66980613 is about 406.1156315227.

The spelling of 66980613 in words is "sixty-six million, nine hundred eighty thousand, six hundred thirteen".