66266550 has 144 divisors (see below), whose sum is σ = 206400480. Its totient is φ = 14929920.

The previous prime is 66266533. The next prime is 66266567. The reversal of 66266550 is 5566266.

It is an interprime number because it is at equal distance from previous prime (66266533) and next prime (66266567).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 343254 + ... + 343446.

Almost surely, 2^66266550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66266550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103200240).

66266550 is an abundant number, since it is smaller than the sum of its proper divisors (140133930).

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

66266550 is a wasteful number, since it uses less digits than its factorization.

66266550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 66266550 is about 8140.4268929829. The cubic root of 66266550 is about 404.6673079424.

The spelling of 66266550 in words is "sixty-six million, two hundred sixty-six thousand, five hundred fifty".