666492464294801 has 2 divisors, whose sum is σ = 666492464294802. Its totient is φ = 666492464294800.

The previous prime is 666492464294621. The next prime is 666492464294803. The reversal of 666492464294801 is 108492464294666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385262113329025 + 281230350965776 = 19628095^2 + 16769924^2 .

It is a cyclic number.

It is not a de Polignac number, because 666492464294801 - 2¹⁸ = 666492464032657 is a prime.

Together with 666492464294803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666492464294803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333246232147400 + 333246232147401.

It is an arithmetic number, because the mean of its divisors is an integer number (333246232147401).

Almost surely, 2^{666492464294801} is an apocalyptic number.

It is an amenable number.

666492464294801 is a deficient number, since it is larger than the sum of its proper divisors (1).

666492464294801 is an equidigital number, since it uses as much as digits as its factorization.

666492464294801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 859963392, while the sum is 71.

The spelling of 666492464294801 in words is "six hundred sixty-six trillion, four hundred ninety-two billion, four hundred sixty-four million, two hundred ninety-four thousand, eight hundred one".