645264287573 has 2 divisors, whose sum is σ = 645264287574. Its totient is φ = 645264287572.

The previous prime is 645264287539. The next prime is 645264287579. The reversal of 645264287573 is 375782462546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350016590884 + 295247696689 = 591622^2 + 543367^2 .

It is a cyclic number.

It is not a de Polignac number, because 645264287573 - 2²⁸ = 644995852117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645264287579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322632143786 + 322632143787.

It is an arithmetic number, because the mean of its divisors is an integer number (322632143787).

Almost surely, 2^645264287573 is an apocalyptic number.

It is an amenable number.

645264287573 is a deficient number, since it is larger than the sum of its proper divisors (1).

645264287573 is an equidigital number, since it uses as much as digits as its factorization.

645264287573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67737600, while the sum is 59.

The spelling of 645264287573 in words is "six hundred forty-five billion, two hundred sixty-four million, two hundred eighty-seven thousand, five hundred seventy-three".