66616676 has 36 divisors (see below), whose sum is σ = 143596908. Its totient is φ = 26869248.

The previous prime is 66616663. The next prime is 66616691. The reversal of 66616676 is 67661666.

It can be written as a sum of positive squares in 2 ways, for example, as 45914176 + 20702500 = 6776^2 + 4550^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6665 + ... + 13328.

It is an arithmetic number, because the mean of its divisors is an integer number (3988803).

Almost surely, 2^66616676 is an apocalyptic number.

It is an amenable number.

66616676 is an abundant number, since it is smaller than the sum of its proper divisors (76980232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66616676 is a wasteful number, since it uses less digits than its factorization.

66616676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20028 (or 20019 counting only the distinct ones).

The product of its digits is 326592, while the sum is 44.

The square root of 66616676 is about 8161.9039445463. The cubic root of 66616676 is about 405.3787565838.

The spelling of 66616676 in words is "sixty-six million, six hundred sixteen thousand, six hundred seventy-six".