66661976 has 16 divisors (see below), whose sum is σ = 127110600. Its totient is φ = 32765824.

The previous prime is 66661957. The next prime is 66661993. The reversal of 66661976 is 67916666.

It is a self number, because there is not a number n which added to its sum of digits gives 66661976.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70145 + ... + 71088.

Almost surely, 2^66661976 is an apocalyptic number.

It is an amenable number.

66661976 is a deficient number, since it is larger than the sum of its proper divisors (60448624).

66661976 is a wasteful number, since it uses less digits than its factorization.

66661976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141298 (or 141294 counting only the distinct ones).

The product of its digits is 489888, while the sum is 47.

The square root of 66661976 is about 8164.6785607273. The cubic root of 66661976 is about 405.4706229545.

The spelling of 66661976 in words is "sixty-six million, six hundred sixty-one thousand, nine hundred seventy-six".