66531080 has 64 divisors (see below), whose sum is σ = 186641280. Its totient is φ = 20736000.

The previous prime is 66531077. The next prime is 66531083. The reversal of 66531080 is 8013566.

It is an interprime number because it is at equal distance from previous prime (66531077) and next prime (66531083).

It is not an unprimeable number, because it can be changed into a prime (66531083) 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, 7721 + ... + 13880.

It is an arithmetic number, because the mean of its divisors is an integer number (2916270).

Almost surely, 2^66531080 is an apocalyptic number.

It is an amenable number.

66531080 is an abundant number, since it is smaller than the sum of its proper divisors (120110200).

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

66531080 is a wasteful number, since it uses less digits than its factorization.

66531080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21630 (or 21626 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66531080 is about 8156.6586296105. The cubic root of 66531080 is about 405.2050579731.

The spelling of 66531080 in words is "sixty-six million, five hundred thirty-one thousand, eighty".