66876581 has 8 divisors (see below), whose sum is σ = 70060800. Its totient is φ = 63750960.

The previous prime is 66876577. The next prime is 66876587. The reversal of 66876581 is 18567866.

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

It is a cyclic number.

It is not a de Polignac number, because 66876581 - 2² = 66876577 is a prime.

It is a super-2 number, since 2×66876581² = 8944954172499122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66876587) 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, 12305 + ... + 16886.

It is an arithmetic number, because the mean of its divisors is an integer number (8757600).

Almost surely, 2^66876581 is an apocalyptic number.

It is an amenable number.

66876581 is a deficient number, since it is larger than the sum of its proper divisors (3184219).

66876581 is a wasteful number, since it uses less digits than its factorization.

66876581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29299.

The product of its digits is 483840, while the sum is 47.

The square root of 66876581 is about 8177.8102814873. The cubic root of 66876581 is about 405.9052675998.

The spelling of 66876581 in words is "sixty-six million, eight hundred seventy-six thousand, five hundred eighty-one".