645914701 has 2 divisors, whose sum is σ = 645914702. Its totient is φ = 645914700.

The previous prime is 645914693. The next prime is 645914777. The reversal of 645914701 is 107419546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412130601 + 233784100 = 20301^2 + 15290^2 .

It is a cyclic number.

It is not a de Polignac number, because 645914701 - 2³ = 645914693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645914501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322957350 + 322957351.

It is an arithmetic number, because the mean of its divisors is an integer number (322957351).

Almost surely, 2^645914701 is an apocalyptic number.

It is an amenable number.

645914701 is a deficient number, since it is larger than the sum of its proper divisors (1).

645914701 is an equidigital number, since it uses as much as digits as its factorization.

645914701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 645914701 is about 25414.8519767478. The cubic root of 645914701 is about 864.4204972804.

The spelling of 645914701 in words is "six hundred forty-five million, nine hundred fourteen thousand, seven hundred one".