66965550 has 48 divisors (see below), whose sum is σ = 175850352. Its totient is φ = 16806400.

The previous prime is 66965527. The next prime is 66965551. The reversal of 66965550 is 5556966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66965551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10581 + ... + 15680.

It is an arithmetic number, because the mean of its divisors is an integer number (3663549).

Almost surely, 2^66965550 is an apocalyptic number.

66965550 is an abundant number, since it is smaller than the sum of its proper divisors (108884802).

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

66965550 is a wasteful number, since it uses less digits than its factorization.

66965550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26293 (or 26288 counting only the distinct ones).

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

The square root of 66965550 is about 8183.2481326182. The cubic root of 66965550 is about 406.0851860046.

It can be divided in two parts, 6696 and 5550, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 66965550 in words is "sixty-six million, nine hundred sixty-five thousand, five hundred fifty".