66673856 has 14 divisors (see below), whose sum is σ = 132306060. Its totient is φ = 33336896.

The previous prime is 66673843. The next prime is 66673879. The reversal of 66673856 is 65837666.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66673856.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520826 + ... + 520953.

Almost surely, 2^66673856 is an apocalyptic number.

It is an amenable number.

66673856 is a deficient number, since it is larger than the sum of its proper divisors (65632204).

66673856 is a wasteful number, since it uses less digits than its factorization.

66673856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041791 (or 1041781 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 47.

The square root of 66673856 is about 8165.4060523651. The cubic root of 66673856 is about 405.4947081735.

The spelling of 66673856 in words is "sixty-six million, six hundred seventy-three thousand, eight hundred fifty-six".