645758667270 has 24 divisors (see below), whose sum is σ = 1678972535136. Its totient is φ = 172202311248.

The previous prime is 645758667251. The next prime is 645758667349. The reversal of 645758667270 is 72766857546.

645758667270 is a `hidden beast` number, since 6 + 45 + 7 + 586 + 6 + 7 + 2 + 7 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 645758667198 and 645758667207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3587548062 + ... + 3587548241.

It is an arithmetic number, because the mean of its divisors is an integer number (69957188964).

Almost surely, 2^645758667270 is an apocalyptic number.

645758667270 is an abundant number, since it is smaller than the sum of its proper divisors (1033213867866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645758667270 is a wasteful number, since it uses less digits than its factorization.

645758667270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7175096316 (or 7175096313 counting only the distinct ones).

The product of its (nonzero) digits is 118540800, while the sum is 63.

The spelling of 645758667270 in words is "six hundred forty-five billion, seven hundred fifty-eight million, six hundred sixty-seven thousand, two hundred seventy".