645487079 has 2 divisors, whose sum is σ = 645487080. Its totient is φ = 645487078.

The previous prime is 645487043. The next prime is 645487151. The reversal of 645487079 is 970784546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645487079 - 2¹² = 645482983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645487379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322743539 + 322743540.

It is an arithmetic number, because the mean of its divisors is an integer number (322743540).

Almost surely, 2^645487079 is an apocalyptic number.

645487079 is a deficient number, since it is larger than the sum of its proper divisors (1).

645487079 is an equidigital number, since it uses as much as digits as its factorization.

645487079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The square root of 645487079 is about 25406.4377471538. The cubic root of 645487079 is about 864.2296945708.

The spelling of 645487079 in words is "six hundred forty-five million, four hundred eighty-seven thousand, seventy-nine".