66549956 has 24 divisors (see below), whose sum is σ = 127915200. Its totient is φ = 30044000.

The previous prime is 66549947. The next prime is 66549991. The reversal of 66549956 is 65994566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1481 + ... + 11631.

It is an arithmetic number, because the mean of its divisors is an integer number (5329800).

Almost surely, 2^66549956 is an apocalyptic number.

It is an amenable number.

66549956 is a deficient number, since it is larger than the sum of its proper divisors (61365244).

66549956 is a wasteful number, since it uses less digits than its factorization.

66549956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10315 (or 10313 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 50.

The square root of 66549956 is about 8157.8156390053. The cubic root of 66549956 is about 405.2433755406.

The spelling of 66549956 in words is "sixty-six million, five hundred forty-nine thousand, nine hundred fifty-six".