66881383 has 8 divisors (see below), whose sum is σ = 72463248. Its totient is φ = 61482624.

The previous prime is 66881377. The next prime is 66881407. The reversal of 66881383 is 38318866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66881383 - 2⁵ = 66881351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66831383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45016 + ... + 46477.

It is an arithmetic number, because the mean of its divisors is an integer number (9057906).

Almost surely, 2^66881383 is an apocalyptic number.

66881383 is a deficient number, since it is larger than the sum of its proper divisors (5581865).

66881383 is a wasteful number, since it uses less digits than its factorization.

66881383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91553.

The product of its digits is 165888, while the sum is 43.

The square root of 66881383 is about 8178.1038755937. The cubic root of 66881383 is about 405.9149825624.

The spelling of 66881383 in words is "sixty-six million, eight hundred eighty-one thousand, three hundred eighty-three".