645548778059 has 2 divisors, whose sum is σ = 645548778060. Its totient is φ = 645548778058.

The previous prime is 645548778053. The next prime is 645548778113. The reversal of 645548778059 is 950877845546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645548778059 - 2²⁰ = 645547729483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645548778059.

It is not a weakly prime, because it can be changed into another prime (645548778053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322774389029 + 322774389030.

It is an arithmetic number, because the mean of its divisors is an integer number (322774389030).

Almost surely, 2^645548778059 is an apocalyptic number.

645548778059 is a deficient number, since it is larger than the sum of its proper divisors (1).

645548778059 is an equidigital number, since it uses as much as digits as its factorization.

645548778059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688000, while the sum is 68.

The spelling of 645548778059 in words is "six hundred forty-five billion, five hundred forty-eight million, seven hundred seventy-eight thousand, fifty-nine".