645704260057 has 2 divisors, whose sum is σ = 645704260058. Its totient is φ = 645704260056.

The previous prime is 645704260039. The next prime is 645704260067. The reversal of 645704260057 is 750062407546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 406254539161 + 239449720896 = 637381^2 + 489336^2 .

It is a cyclic number.

It is not a de Polignac number, because 645704260057 - 2¹¹ = 645704258009 is a prime.

It is a super-3 number, since 3×645704260057³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645704259989 and 645704260016.

It is not a weakly prime, because it can be changed into another prime (645704260037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322852130028 + 322852130029.

It is an arithmetic number, because the mean of its divisors is an integer number (322852130029).

Almost surely, 2^645704260057 is an apocalyptic number.

It is an amenable number.

645704260057 is a deficient number, since it is larger than the sum of its proper divisors (1).

645704260057 is an equidigital number, since it uses as much as digits as its factorization.

645704260057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1411200, while the sum is 46.

The spelling of 645704260057 in words is "six hundred forty-five billion, seven hundred four million, two hundred sixty thousand, fifty-seven".