66265566 has 8 divisors (see below), whose sum is σ = 132531144. Its totient is φ = 22088520.

The previous prime is 66265547. The next prime is 66265567. The reversal of 66265566 is 66556266.

It is a sphenic number, since it is the product of 3 distinct primes.

66265566 is an admirable number.

It is a super-2 number, since 2×66265566² = 8782250474600712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66265567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5522125 + ... + 5522136.

It is an arithmetic number, because the mean of its divisors is an integer number (16566393).

Almost surely, 2^66265566 is an apocalyptic number.

66265566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66265566 is a wasteful number, since it uses less digits than its factorization.

66265566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11044266.

The product of its digits is 388800, while the sum is 42.

The square root of 66265566 is about 8140.3664536678. The cubic root of 66265566 is about 404.6653049479.

The spelling of 66265566 in words is "sixty-six million, two hundred sixty-five thousand, five hundred sixty-six".