645758520787 has 2 divisors, whose sum is σ = 645758520788. Its totient is φ = 645758520786.

The previous prime is 645758520779. The next prime is 645758520793. The reversal of 645758520787 is 787025857546.

645758520787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645758520787 - 2³ = 645758520779 is a prime.

It is a super-2 number, since 2×645758520787² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (645758524787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322879260393 + 322879260394.

It is an arithmetic number, because the mean of its divisors is an integer number (322879260394).

Almost surely, 2^645758520787 is an apocalyptic number.

645758520787 is a deficient number, since it is larger than the sum of its proper divisors (1).

645758520787 is an equidigital number, since it uses as much as digits as its factorization.

645758520787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131712000, while the sum is 64.

The spelling of 645758520787 in words is "six hundred forty-five billion, seven hundred fifty-eight million, five hundred twenty thousand, seven hundred eighty-seven".