66255560 has 32 divisors (see below), whose sum is σ = 170372160. Its totient is φ = 22716096.

The previous prime is 66255557. The next prime is 66255569. The reversal of 66255560 is 6555266.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 66255560.

It is not an unprimeable number, because it can be changed into a prime (66255569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118034 + ... + 118593.

It is an arithmetic number, because the mean of its divisors is an integer number (5324130).

Almost surely, 2^66255560 is an apocalyptic number.

It is an amenable number.

66255560 is an abundant number, since it is smaller than the sum of its proper divisors (104116600).

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

66255560 is a wasteful number, since it uses less digits than its factorization.

66255560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236645 (or 236641 counting only the distinct ones).

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

The square root of 66255560 is about 8139.7518389690. The cubic root of 66255560 is about 404.6449359735.

The spelling of 66255560 in words is "sixty-six million, two hundred fifty-five thousand, five hundred sixty".