66086520 has 32 divisors (see below), whose sum is σ = 198259920. Its totient is φ = 17623040.

The previous prime is 66086491. The next prime is 66086533. The reversal of 66086520 is 2568066.

It is a zygodrome in base 2.

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, 275241 + ... + 275480.

Almost surely, 2^66086520 is an apocalyptic number.

66086520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66086520 is an abundant number, since it is smaller than the sum of its proper divisors (132173400).

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

66086520 is a wasteful number, since it uses less digits than its factorization.

66086520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550735 (or 550731 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 66086520 is about 8129.3615985513. The cubic root of 66086520 is about 404.3005148966.

The spelling of 66086520 in words is "sixty-six million, eighty-six thousand, five hundred twenty".