66600550 has 24 divisors (see below), whose sum is σ = 126761976. Its totient is φ = 26019840.

The previous prime is 66600539. The next prime is 66600563. The reversal of 66600550 is 5500666.

It is a congruent number.

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, 13339 + ... + 17638.

It is an arithmetic number, because the mean of its divisors is an integer number (5281749).

Almost surely, 2^66600550 is an apocalyptic number.

66600550 is a deficient number, since it is larger than the sum of its proper divisors (60161426).

66600550 is a wasteful number, since it uses less digits than its factorization.

66600550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31032 (or 31027 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 66600550 is about 8160.9160025085. The cubic root of 66600550 is about 405.3460437268.

The spelling of 66600550 in words is "sixty-six million, six hundred thousand, five hundred fifty".