666061665463 has 2 divisors, whose sum is σ = 666061665464. Its totient is φ = 666061665462.

The previous prime is 666061665277. The next prime is 666061665523. The reversal of 666061665463 is 364566160666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666061665463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666061765463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333030832731 + 333030832732.

It is an arithmetic number, because the mean of its divisors is an integer number (333030832732).

Almost surely, 2^666061665463 is an apocalyptic number.

666061665463 is a deficient number, since it is larger than the sum of its proper divisors (1).

666061665463 is an equidigital number, since it uses as much as digits as its factorization.

666061665463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16796160, while the sum is 55.

The spelling of 666061665463 in words is "six hundred sixty-six billion, sixty-one million, six hundred sixty-five thousand, four hundred sixty-three".