666779011741 has 2 divisors, whose sum is σ = 666779011742. Its totient is φ = 666779011740.

The previous prime is 666779011739. The next prime is 666779011823. The reversal of 666779011741 is 147110977666.

666779011741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640520105625 + 26258906116 = 800325^2 + 162046^2 .

It is a cyclic number.

It is not a de Polignac number, because 666779011741 - 2¹ = 666779011739 is a prime.

Together with 666779011739, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666779011541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333389505870 + 333389505871.

It is an arithmetic number, because the mean of its divisors is an integer number (333389505871).

Almost surely, 2^666779011741 is an apocalyptic number.

It is an amenable number.

666779011741 is a deficient number, since it is larger than the sum of its proper divisors (1).

666779011741 is an equidigital number, since it uses as much as digits as its factorization.

666779011741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 666779011741 in words is "six hundred sixty-six billion, seven hundred seventy-nine million, eleven thousand, seven hundred forty-one".