664066770071761 has 12 divisors (see below), whose sum is σ = 775357529140980. Its totient is φ = 567084103162080.

The previous prime is 664066770071741. The next prime is 664066770071891. The reversal of 664066770071761 is 167170077660466.

It can be written as a sum of positive squares in 2 ways, for example, as 59906052010000 + 604160718061761 = 7739900^2 + 24579681^2 .

It is not a de Polignac number, because 664066770071761 - 2⁵ = 664066770071729 is a prime.

It is a super-2 number, since 2×664066770071761² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664066770071693 and 664066770071702.

It is not an unprimeable number, because it can be changed into a prime (664066770071741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25190289910 + ... + 25190316271.

It is an arithmetic number, because the mean of its divisors is an integer number (64613127428415).

Almost surely, 2^{664066770071761} is an apocalyptic number.

It is an amenable number.

664066770071761 is a deficient number, since it is larger than the sum of its proper divisors (111290759069219).

664066770071761 is a wasteful number, since it uses less digits than its factorization.

664066770071761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50380606464 (or 50380606457 counting only the distinct ones).

The product of its (nonzero) digits is 74680704, while the sum is 64.

The spelling of 664066770071761 in words is "six hundred sixty-four trillion, sixty-six billion, seven hundred seventy million, seventy-one thousand, seven hundred sixty-one".