66237481 has 2 divisors, whose sum is σ = 66237482. Its totient is φ = 66237480.

The previous prime is 66237461. The next prime is 66237497. The reversal of 66237481 is 18473266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62173225 + 4064256 = 7885^2 + 2016^2 .

It is a cyclic number.

It is not a de Polignac number, because 66237481 - 2²³ = 57848873 is a prime.

It is a super-2 number, since 2×66237481² = 8774807778450722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66237481.

It is not a weakly prime, because it can be changed into another prime (66237461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33118740 + 33118741.

It is an arithmetic number, because the mean of its divisors is an integer number (33118741).

Almost surely, 2^66237481 is an apocalyptic number.

It is an amenable number.

66237481 is a deficient number, since it is larger than the sum of its proper divisors (1).

66237481 is an equidigital number, since it uses as much as digits as its factorization.

66237481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 66237481 is about 8138.6412256592. The cubic root of 66237481 is about 404.6081277856.

The spelling of 66237481 in words is "sixty-six million, two hundred thirty-seven thousand, four hundred eighty-one".