66132731 has 8 divisors (see below), whose sum is σ = 78186720. Its totient is φ = 54730368.

The previous prime is 66132721. The next prime is 66132739. The reversal of 66132731 is 13723166.

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

It is not a de Polignac number, because 66132731 - 2¹⁰ = 66131707 is a prime.

It is a super-2 number, since 2×66132731² = 8747076219036722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66132694 and 66132703.

It is not an unprimeable number, because it can be changed into a prime (66132739) 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, 162686 + ... + 163091.

It is an arithmetic number, because the mean of its divisors is an integer number (9773340).

Almost surely, 2^66132731 is an apocalyptic number.

66132731 is a deficient number, since it is larger than the sum of its proper divisors (12053989).

66132731 is a wasteful number, since it uses less digits than its factorization.

66132731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325813.

The product of its digits is 4536, while the sum is 29.

The square root of 66132731 is about 8132.2033299715. The cubic root of 66132731 is about 404.3947286539.

Adding to 66132731 its reverse (13723166), we get a palindrome (79855897).

The spelling of 66132731 in words is "sixty-six million, one hundred thirty-two thousand, seven hundred thirty-one".