66682550 has 48 divisors (see below), whose sum is σ = 139705344. Its totient is φ = 23460000.

The previous prime is 66682501. The next prime is 66682559. The reversal of 66682550 is 5528666.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66682559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15095 + ... + 19005.

It is an arithmetic number, because the mean of its divisors is an integer number (2910528).

Almost surely, 2^66682550 is an apocalyptic number.

66682550 is an abundant number, since it is smaller than the sum of its proper divisors (73022794).

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

66682550 is a wasteful number, since it uses less digits than its factorization.

66682550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3965 (or 3960 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 66682550 is about 8165.9384029026. The cubic root of 66682550 is about 405.5123323618.

The spelling of 66682550 in words is "sixty-six million, six hundred eighty-two thousand, five hundred fifty".