645491000071 has 2 divisors, whose sum is σ = 645491000072. Its totient is φ = 645491000070.

The previous prime is 645491000009. The next prime is 645491000107. The reversal of 645491000071 is 170000194546.

Together with next prime (645491000107) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645491000071 - 2²³ = 645482611463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645491000971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322745500035 + 322745500036.

It is an arithmetic number, because the mean of its divisors is an integer number (322745500036).

Almost surely, 2^645491000071 is an apocalyptic number.

645491000071 is a deficient number, since it is larger than the sum of its proper divisors (1).

645491000071 is an equidigital number, since it uses as much as digits as its factorization.

645491000071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 645491000071 in words is "six hundred forty-five billion, four hundred ninety-one million, seventy-one", and thus it is an aban number.