66087761 has 2 divisors, whose sum is σ = 66087762. Its totient is φ = 66087760.

The previous prime is 66087733. The next prime is 66087779. The reversal of 66087761 is 16778066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39627025 + 26460736 = 6295^2 + 5144^2 .

It is a cyclic number.

It is not a de Polignac number, because 66087761 - 2²² = 61893457 is a prime.

It is not a weakly prime, because it can be changed into another prime (66087961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33043880 + 33043881.

It is an arithmetic number, because the mean of its divisors is an integer number (33043881).

Almost surely, 2^66087761 is an apocalyptic number.

It is an amenable number.

66087761 is a deficient number, since it is larger than the sum of its proper divisors (1).

66087761 is an equidigital number, since it uses as much as digits as its factorization.

66087761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 66087761 is about 8129.4379264498. The cubic root of 66087761 is about 404.3030455882.

The spelling of 66087761 in words is "sixty-six million, eighty-seven thousand, seven hundred sixty-one".