645264295771 has 2 divisors, whose sum is σ = 645264295772. Its totient is φ = 645264295770.

The previous prime is 645264295751. The next prime is 645264295789. The reversal of 645264295771 is 177592462546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645264295771 - 2¹³ = 645264287579 is a prime.

It is a super-2 number, since 2×645264295771² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (645264295721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322632147885 + 322632147886.

It is an arithmetic number, because the mean of its divisors is an integer number (322632147886).

Almost surely, 2^645264295771 is an apocalyptic number.

645264295771 is a deficient number, since it is larger than the sum of its proper divisors (1).

645264295771 is an equidigital number, since it uses as much as digits as its factorization.

645264295771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25401600, while the sum is 58.

The spelling of 645264295771 in words is "six hundred forty-five billion, two hundred sixty-four million, two hundred ninety-five thousand, seven hundred seventy-one".