645113687650 has 24 divisors (see below), whose sum is σ = 1200474731664. Its totient is φ = 257924341200.

The previous prime is 645113687633. The next prime is 645113687653. The reversal of 645113687650 is 56786311546.

645113687650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645113687653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2920732 + ... + 3133831.

It is an arithmetic number, because the mean of its divisors is an integer number (50019780486).

Almost surely, 2^645113687650 is an apocalyptic number.

645113687650 is a deficient number, since it is larger than the sum of its proper divisors (555361044014).

645113687650 is a wasteful number, since it uses less digits than its factorization.

645113687650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6056706 (or 6056701 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 645113687650 in words is "six hundred forty-five billion, one hundred thirteen million, six hundred eighty-seven thousand, six hundred fifty".