66331731 has 8 divisors (see below), whose sum is σ = 88480000. Its totient is φ = 44202312.

The previous prime is 66331721. The next prime is 66331751. The reversal of 66331731 is 13713366.

66331731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 66331731 - 2⁶ = 66331667 is a prime.

It is a super-2 number, since 2×66331731² = 8799797074912722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66331721) 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 7 ways as a sum of consecutive naturals, for example, 10770 + ... + 15768.

It is an arithmetic number, because the mean of its divisors is an integer number (11060000).

Almost surely, 2^66331731 is an apocalyptic number.

66331731 is a deficient number, since it is larger than the sum of its proper divisors (22148269).

66331731 is a wasteful number, since it uses less digits than its factorization.

66331731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9425.

The product of its digits is 6804, while the sum is 30.

The square root of 66331731 is about 8144.4294459465. The cubic root of 66331731 is about 404.7999438718.

The spelling of 66331731 in words is "sixty-six million, three hundred thirty-one thousand, seven hundred thirty-one".