645617046717 has 64 divisors (see below), whose sum is σ = 1023650611200. Its totient is φ = 401164410240.

The previous prime is 645617046677. The next prime is 645617046733. The reversal of 645617046717 is 717640716546.

645617046717 is a `hidden beast` number, since 6 + 4 + 5 + 6 + 170 + 467 + 1 + 7 = 666.

645617046717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645617046717 - 2⁸ = 645617046461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645617046917) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21346668 + ... + 21376890.

It is an arithmetic number, because the mean of its divisors is an integer number (15994540800).

Almost surely, 2^645617046717 is an apocalyptic number.

It is an amenable number.

645617046717 is a deficient number, since it is larger than the sum of its proper divisors (378033564483).

645617046717 is a wasteful number, since it uses less digits than its factorization.

645617046717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31135 (or 31129 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 54.

The spelling of 645617046717 in words is "six hundred forty-five billion, six hundred seventeen million, forty-six thousand, seven hundred seventeen".