66695550 has 24 divisors (see below), whose sum is σ = 165405336. Its totient is φ = 17785440.

The previous prime is 66695543. The next prime is 66695569. The reversal of 66695550 is 5559666.

It is a Curzon number.

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, 222169 + ... + 222468.

It is an arithmetic number, because the mean of its divisors is an integer number (6891889).

Almost surely, 2^66695550 is an apocalyptic number.

66695550 is an abundant number, since it is smaller than the sum of its proper divisors (98709786).

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

66695550 is a wasteful number, since it uses less digits than its factorization.

66695550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444652 (or 444647 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 42.

The square root of 66695550 is about 8166.7343534610. The cubic root of 66695550 is about 405.5386826727.

The spelling of 66695550 in words is "sixty-six million, six hundred ninety-five thousand, five hundred fifty".