645260062121 has 2 divisors, whose sum is σ = 645260062122. Its totient is φ = 645260062120.

The previous prime is 645260062001. The next prime is 645260062123. The reversal of 645260062121 is 121260062546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401149956496 + 244110105625 = 633364^2 + 494075^2 .

It is a cyclic number.

It is not a de Polignac number, because 645260062121 - 2³⁴ = 628080192937 is a prime.

Together with 645260062123, 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 (645260062123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322630031060 + 322630031061.

It is an arithmetic number, because the mean of its divisors is an integer number (322630031061).

Almost surely, 2^645260062121 is an apocalyptic number.

It is an amenable number.

645260062121 is a deficient number, since it is larger than the sum of its proper divisors (1).

645260062121 is an equidigital number, since it uses as much as digits as its factorization.

645260062121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 645260062121 in words is "six hundred forty-five billion, two hundred sixty million, sixty-two thousand, one hundred twenty-one".