63591066 has 144 divisors (see below), whose sum is σ = 178930752. Its totient is φ = 15966720.

The previous prime is 63591061. The next prime is 63591071. The reversal of 63591066 is 66019536.

63591066 is a `hidden beast` number, since 6 + 3 + 591 + 0 + 66 = 666.

63591066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (63591061) and next prime (63591071).

It is a self number, because there is not a number n which added to its sum of digits gives 63591066.

It is not an unprimeable number, because it can be changed into a prime (63591061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 655530 + ... + 655626.

Almost surely, 2^63591066 is an apocalyptic number.

63591066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 63591066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89465376).

63591066 is an abundant number, since it is smaller than the sum of its proper divisors (115339686).

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

63591066 is a wasteful number, since it uses less digits than its factorization.

63591066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 63591066 is about 7974.4006671348. The cubic root of 63591066 is about 399.1462331687.

The spelling of 63591066 in words is "sixty-three million, five hundred ninety-one thousand, sixty-six".