66505080 has 32 divisors (see below), whose sum is σ = 199515600. Its totient is φ = 17734656.

The previous prime is 66505079. The next prime is 66505093. The reversal of 66505080 is 8050566.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276985 + ... + 277224.

Almost surely, 2^66505080 is an apocalyptic number.

66505080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66505080 is an abundant number, since it is smaller than the sum of its proper divisors (133010520).

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

66505080 is a wasteful number, since it uses less digits than its factorization.

66505080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554223 (or 554219 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 66505080 is about 8155.0646839863. The cubic root of 66505080 is about 405.1522670861.

The spelling of 66505080 in words is "sixty-six million, five hundred five thousand, eighty".