66347131 has 2 divisors, whose sum is σ = 66347132. Its totient is φ = 66347130.

The previous prime is 66347119. The next prime is 66347137. The reversal of 66347131 is 13174366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66347131 - 2⁷ = 66347003 is a prime.

It is a super-2 number, since 2×66347131² = 8803883583862322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66347093 and 66347102.

It is not a weakly prime, because it can be changed into another prime (66347137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33173565 + 33173566.

It is an arithmetic number, because the mean of its divisors is an integer number (33173566).

Almost surely, 2^66347131 is an apocalyptic number.

66347131 is a deficient number, since it is larger than the sum of its proper divisors (1).

66347131 is an equidigital number, since it uses as much as digits as its factorization.

66347131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 66347131 is about 8145.3748225603. The cubic root of 66347131 is about 404.8312684313.

The spelling of 66347131 in words is "sixty-six million, three hundred forty-seven thousand, one hundred thirty-one".