66550880 has 48 divisors (see below), whose sum is σ = 171524304. Its totient is φ = 24199680.

The previous prime is 66550871. The next prime is 66550889. The reversal of 66550880 is 8805566.

It is an interprime number because it is at equal distance from previous prime (66550871) and next prime (66550889).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550889) 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, 17147 + ... + 20666.

It is an arithmetic number, because the mean of its divisors is an integer number (3573423).

Almost surely, 2^66550880 is an apocalyptic number.

It is an amenable number.

66550880 is an abundant number, since it is smaller than the sum of its proper divisors (104973424).

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

66550880 is a wasteful number, since it uses less digits than its factorization.

66550880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37839 (or 37831 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 66550880 is about 8157.8722716159. The cubic root of 66550880 is about 405.2452510397.

The spelling of 66550880 in words is "sixty-six million, five hundred fifty thousand, eight hundred eighty".