645144641807 has 2 divisors, whose sum is σ = 645144641808. Its totient is φ = 645144641806.

The previous prime is 645144641777. The next prime is 645144641861. The reversal of 645144641807 is 708146441546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645144641807 - 2³⁸ = 370266734863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645144640807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322572320903 + 322572320904.

It is an arithmetic number, because the mean of its divisors is an integer number (322572320904).

Almost surely, 2^645144641807 is an apocalyptic number.

645144641807 is a deficient number, since it is larger than the sum of its proper divisors (1).

645144641807 is an equidigital number, since it uses as much as digits as its factorization.

645144641807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2580480, while the sum is 50.

The spelling of 645144641807 in words is "six hundred forty-five billion, one hundred forty-four million, six hundred forty-one thousand, eight hundred seven".