66116731 has 2 divisors, whose sum is σ = 66116732. Its totient is φ = 66116730.

The previous prime is 66116717. The next prime is 66116747. The reversal of 66116731 is 13761166.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66116731 is a prime.

It is a super-2 number, since 2×66116731² = 8742844236252722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66116693 and 66116702.

It is not a weakly prime, because it can be changed into another prime (66116711) 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 as a sum of consecutive naturals, namely, 33058365 + 33058366.

It is an arithmetic number, because the mean of its divisors is an integer number (33058366).

Almost surely, 2^66116731 is an apocalyptic number.

66116731 is a deficient number, since it is larger than the sum of its proper divisors (1).

66116731 is an equidigital number, since it uses as much as digits as its factorization.

66116731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 66116731 is about 8131.2195272296. The cubic root of 66116731 is about 404.3621132483.

Adding to 66116731 its reverse (13761166), we get a palindrome (79877897).

The spelling of 66116731 in words is "sixty-six million, one hundred sixteen thousand, seven hundred thirty-one".