66147131 has 2 divisors, whose sum is σ = 66147132. Its totient is φ = 66147130.

The previous prime is 66147097. The next prime is 66147139. The reversal of 66147131 is 13174166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66147131 - 2¹⁰ = 66146107 is a prime.

It is a super-2 number, since 2×66147131² = 8750885879062322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66147094 and 66147103.

It is not a weakly prime, because it can be changed into another prime (66147139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33073565 + 33073566.

It is an arithmetic number, because the mean of its divisors is an integer number (33073566).

Almost surely, 2^66147131 is an apocalyptic number.

66147131 is a deficient number, since it is larger than the sum of its proper divisors (1).

66147131 is an equidigital number, since it uses as much as digits as its factorization.

66147131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 66147131 is about 8133.0886506911. The cubic root of 66147131 is about 404.4240780214.

The spelling of 66147131 in words is "sixty-six million, one hundred forty-seven thousand, one hundred thirty-one".