66146461 has 2 divisors, whose sum is σ = 66146462. Its totient is φ = 66146460.

The previous prime is 66146453. The next prime is 66146519. The reversal of 66146461 is 16464166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47527236 + 18619225 = 6894^2 + 4315^2 .

It is a cyclic number.

It is not a de Polignac number, because 66146461 - 2³ = 66146453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66146401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33073230 + 33073231.

It is an arithmetic number, because the mean of its divisors is an integer number (33073231).

Almost surely, 2^66146461 is an apocalyptic number.

It is an amenable number.

66146461 is a deficient number, since it is larger than the sum of its proper divisors (1).

66146461 is an equidigital number, since it uses as much as digits as its factorization.

66146461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 66146461 is about 8133.0474608230. The cubic root of 66146461 is about 404.4227125550.

The spelling of 66146461 in words is "sixty-six million, one hundred forty-six thousand, four hundred sixty-one".