666034721623351 has 2 divisors, whose sum is σ = 666034721623352. Its totient is φ = 666034721623350.

The previous prime is 666034721623247. The next prime is 666034721623387. The reversal of 666034721623351 is 153326127430666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666034721623351 - 2¹¹ = 666034721621303 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666034721623292 and 666034721623301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666034721623151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333017360811675 + 333017360811676.

It is an arithmetic number, because the mean of its divisors is an integer number (333017360811676).

Almost surely, 2^{666034721623351} is an apocalyptic number.

666034721623351 is a deficient number, since it is larger than the sum of its proper divisors (1).

666034721623351 is an equidigital number, since it uses as much as digits as its factorization.

666034721623351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 55.

The spelling of 666034721623351 in words is "six hundred sixty-six trillion, thirty-four billion, seven hundred twenty-one million, six hundred twenty-three thousand, three hundred fifty-one".