666034721623247 has 2 divisors, whose sum is σ = 666034721623248. Its totient is φ = 666034721623246.

The previous prime is 666034721623153. The next prime is 666034721623351. The reversal of 666034721623247 is 742326127430666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666034721623247 - 2³⁴ = 666017541754063 is a prime.

It is a super-2 number, since 2×666034721623247² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666034721628247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333017360811623 + 333017360811624.

It is an arithmetic number, because the mean of its divisors is an integer number (333017360811624).

Almost surely, 2^{666034721623247} is an apocalyptic number.

666034721623247 is a deficient number, since it is larger than the sum of its proper divisors (1).

666034721623247 is an equidigital number, since it uses as much as digits as its factorization.

666034721623247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73156608, while the sum is 59.

The spelling of 666034721623247 in words is "six hundred sixty-six trillion, thirty-four billion, seven hundred twenty-one million, six hundred twenty-three thousand, two hundred forty-seven".