645316761706 has 4 divisors (see below), whose sum is σ = 967975142562. Its totient is φ = 322658380852.

The previous prime is 645316761703. The next prime is 645316761763. The reversal of 645316761706 is 607167613546.

645316761706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 633709931481 + 11606830225 = 796059^2 + 107735^2 .

It is not an unprimeable number, because it can be changed into a prime (645316761701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161329190425 + ... + 161329190428.

Almost surely, 2^645316761706 is an apocalyptic number.

645316761706 is a deficient number, since it is larger than the sum of its proper divisors (322658380856).

645316761706 is a wasteful number, since it uses less digits than its factorization.

645316761706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322658380855.

The product of its (nonzero) digits is 3810240, while the sum is 52.

The spelling of 645316761706 in words is "six hundred forty-five billion, three hundred sixteen million, seven hundred sixty-one thousand, seven hundred six".