66472591 has 2 divisors, whose sum is σ = 66472592. Its totient is φ = 66472590.

The previous prime is 66472519. The next prime is 66472607. The reversal of 66472591 is 19527466.

Together with previous prime (66472519) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66472591 - 2¹¹ = 66470543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66472501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33236295 + 33236296.

It is an arithmetic number, because the mean of its divisors is an integer number (33236296).

Almost surely, 2^66472591 is an apocalyptic number.

66472591 is a deficient number, since it is larger than the sum of its proper divisors (1).

66472591 is an equidigital number, since it uses as much as digits as its factorization.

66472591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 66472591 is about 8153.0724883322. The cubic root of 66472591 is about 405.0862814699.

The spelling of 66472591 in words is "sixty-six million, four hundred seventy-two thousand, five hundred ninety-one".