66662461 has 2 divisors, whose sum is σ = 66662462. Its totient is φ = 66662460.

The previous prime is 66662437. The next prime is 66662483. The reversal of 66662461 is 16426666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62315236 + 4347225 = 7894^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 66662461 - 2²¹ = 64565309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66662461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66662161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33331230 + 33331231.

It is an arithmetic number, because the mean of its divisors is an integer number (33331231).

Almost surely, 2^66662461 is an apocalyptic number.

It is an amenable number.

66662461 is a deficient number, since it is larger than the sum of its proper divisors (1).

66662461 is an equidigital number, since it uses as much as digits as its factorization.

66662461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 37.

The square root of 66662461 is about 8164.7082617813. The cubic root of 66662461 is about 405.4716062875.

The spelling of 66662461 in words is "sixty-six million, six hundred sixty-two thousand, four hundred sixty-one".