645415045601 has 2 divisors, whose sum is σ = 645415045602. Its totient is φ = 645415045600.

The previous prime is 645415045571. The next prime is 645415045603. The reversal of 645415045601 is 106540514546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510333069376 + 135081976225 = 714376^2 + 367535^2 .

It is a cyclic number.

It is not a de Polignac number, because 645415045601 - 2²² = 645410851297 is a prime.

Together with 645415045603, 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 (645415045603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322707522800 + 322707522801.

It is an arithmetic number, because the mean of its divisors is an integer number (322707522801).

Almost surely, 2^645415045601 is an apocalyptic number.

It is an amenable number.

645415045601 is a deficient number, since it is larger than the sum of its proper divisors (1).

645415045601 is an equidigital number, since it uses as much as digits as its factorization.

645415045601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 645415045601 in words is "six hundred forty-five billion, four hundred fifteen million, forty-five thousand, six hundred one".