66361880 has 64 divisors (see below), whose sum is σ = 170281440. Its totient is φ = 23058432.

The previous prime is 66361873. The next prime is 66361907. The reversal of 66361880 is 8816366.

66361880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5087 + ... + 12593.

Almost surely, 2^66361880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66361880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85140720).

66361880 is an abundant number, since it is smaller than the sum of its proper divisors (103919560).

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

66361880 is a wasteful number, since it uses less digits than its factorization.

66361880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7548 (or 7544 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 66361880 is about 8146.2801326741. The cubic root of 66361880 is about 404.8612642724.

The spelling of 66361880 in words is "sixty-six million, three hundred sixty-one thousand, eight hundred eighty".