6666995168461 has 2 divisors, whose sum is σ = 6666995168462. Its totient is φ = 6666995168460.

The previous prime is 6666995168437. The next prime is 6666995168569. The reversal of 6666995168461 is 1648615996666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5772847155625 + 894148012836 = 2402675^2 + 945594^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666995168461 - 2⁵ = 6666995168429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666995163461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333497584230 + 3333497584231.

It is an arithmetic number, because the mean of its divisors is an integer number (3333497584231).

Almost surely, 2^{6666995168461} is an apocalyptic number.

It is an amenable number.

6666995168461 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666995168461 is an equidigital number, since it uses as much as digits as its factorization.

6666995168461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604661760, while the sum is 73.

The spelling of 6666995168461 in words is "six trillion, six hundred sixty-six billion, nine hundred ninety-five million, one hundred sixty-eight thousand, four hundred sixty-one".