645235654241 has 2 divisors, whose sum is σ = 645235654242. Its totient is φ = 645235654240.

The previous prime is 645235654199. The next prime is 645235654321. The reversal of 645235654241 is 142456532546.

645235654241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627785244241 + 17450410000 = 792329^2 + 132100^2 .

It is a cyclic number.

It is not a de Polignac number, because 645235654241 - 2³⁴ = 628055785057 is a prime.

It is a super-2 number, since 2×645235654241² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (645235654841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322617827120 + 322617827121.

It is an arithmetic number, because the mean of its divisors is an integer number (322617827121).

Almost surely, 2^645235654241 is an apocalyptic number.

It is an amenable number.

645235654241 is a deficient number, since it is larger than the sum of its proper divisors (1).

645235654241 is an equidigital number, since it uses as much as digits as its factorization.

645235654241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 47.

The spelling of 645235654241 in words is "six hundred forty-five billion, two hundred thirty-five million, six hundred fifty-four thousand, two hundred forty-one".