645634042612 has 12 divisors (see below), whose sum is σ = 1216771849636. Its totient is φ = 297984942720.

The previous prime is 645634042583. The next prime is 645634042663. The reversal of 645634042612 is 216240436546.

645634042612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 32817496336 + 612816546276 = 181156^2 + 782826^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6208019589 + ... + 6208019692.

Almost surely, 2^645634042612 is an apocalyptic number.

It is an amenable number.

645634042612 is a deficient number, since it is larger than the sum of its proper divisors (571137807024).

645634042612 is a wasteful number, since it uses less digits than its factorization.

645634042612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12416039298 (or 12416039296 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 645634042612 in words is "six hundred forty-five billion, six hundred thirty-four million, forty-two thousand, six hundred twelve".