66565506 has 32 divisors (see below), whose sum is σ = 161101440. Its totient is φ = 17899776.

The previous prime is 66565483. The next prime is 66565529. The reversal of 66565506 is 60556566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66565483) and next prime (66565529).

It is a super-3 number, since 3×66565506³ (a number of 24 digits) contains 333 as substring.

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, 45901 + ... + 47328.

It is an arithmetic number, because the mean of its divisors is an integer number (5034420).

Almost surely, 2^66565506 is an apocalyptic number.

66565506 is an abundant number, since it is smaller than the sum of its proper divisors (94535934).

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

66565506 is a wasteful number, since it uses less digits than its factorization.

66565506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93258.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 66565506 is about 8158.7686570953. The cubic root of 66565506 is about 405.2749360110.

The spelling of 66565506 in words is "sixty-six million, five hundred sixty-five thousand, five hundred six".