645270206519 has 2 divisors, whose sum is σ = 645270206520. Its totient is φ = 645270206518.

The previous prime is 645270206461. The next prime is 645270206549. The reversal of 645270206519 is 915602072546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645270206519 is a prime.

It is a super-2 number, since 2×645270206519² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645270206549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322635103259 + 322635103260.

It is an arithmetic number, because the mean of its divisors is an integer number (322635103260).

Almost surely, 2^645270206519 is an apocalyptic number.

645270206519 is a deficient number, since it is larger than the sum of its proper divisors (1).

645270206519 is an equidigital number, since it uses as much as digits as its factorization.

645270206519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 645270206519 in words is "six hundred forty-five billion, two hundred seventy million, two hundred six thousand, five hundred nineteen".