66266520 has 64 divisors (see below), whose sum is σ = 200884320. Its totient is φ = 17485824.

The previous prime is 66266513. The next prime is 66266533. The reversal of 66266520 is 2566266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8794 + ... + 14486.

Almost surely, 2^66266520 is an apocalyptic number.

66266520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66266520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100442160).

66266520 is an abundant number, since it is smaller than the sum of its proper divisors (134617800).

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

66266520 is a wasteful number, since it uses less digits than its factorization.

66266520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5804 (or 5800 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 66266520 is about 8140.4250503275. The cubic root of 66266520 is about 404.6672468758.

The spelling of 66266520 in words is "sixty-six million, two hundred sixty-six thousand, five hundred twenty".