66760647641 has 2 divisors, whose sum is σ = 66760647642. Its totient is φ = 66760647640.

The previous prime is 66760647637. The next prime is 66760647697. The reversal of 66760647641 is 14674606766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55187406400 + 11573241241 = 234920^2 + 107579^2 .

It is a cyclic number.

It is not a de Polignac number, because 66760647641 - 2² = 66760647637 is a prime.

It is not a weakly prime, because it can be changed into another prime (66760647341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33380323820 + 33380323821.

It is an arithmetic number, because the mean of its divisors is an integer number (33380323821).

Almost surely, 2^66760647641 is an apocalyptic number.

It is an amenable number.

66760647641 is a deficient number, since it is larger than the sum of its proper divisors (1).

66760647641 is an equidigital number, since it uses as much as digits as its factorization.

66760647641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 53.

The spelling of 66760647641 in words is "sixty-six billion, seven hundred sixty million, six hundred forty-seven thousand, six hundred forty-one".