66625550 has 48 divisors (see below), whose sum is σ = 132661152. Its totient is φ = 24806400.

The previous prime is 66625543. The next prime is 66625561. The reversal of 66625550 is 5552666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66625550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87170 + ... + 87930.

It is an arithmetic number, because the mean of its divisors is an integer number (2763774).

Almost surely, 2^66625550 is an apocalyptic number.

66625550 is a deficient number, since it is larger than the sum of its proper divisors (66035602).

66625550 is a wasteful number, since it uses less digits than its factorization.

66625550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 66625550 is about 8162.4475496018. The cubic root of 66625550 is about 405.3967559376.

The spelling of 66625550 in words is "sixty-six million, six hundred twenty-five thousand, five hundred fifty".