66557268 has 48 divisors (see below), whose sum is σ = 176776320. Its totient is φ = 21643200.

The previous prime is 66557243. The next prime is 66557269. The reversal of 66557268 is 86275566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66557269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3088 + ... + 11943.

It is an arithmetic number, because the mean of its divisors is an integer number (3682840).

Almost surely, 2^66557268 is an apocalyptic number.

It is an amenable number.

66557268 is an abundant number, since it is smaller than the sum of its proper divisors (110219052).

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

66557268 is a wasteful number, since it uses less digits than its factorization.

66557268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15085 (or 15077 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 66557268 is about 8158.2637858799. The cubic root of 66557268 is about 405.2582166776.

The spelling of 66557268 in words is "sixty-six million, five hundred fifty-seven thousand, two hundred sixty-eight".