645140929938 has 16 divisors (see below), whose sum is σ = 1290292126560. Its totient is φ = 215045265536.

The previous prime is 645140929931. The next prime is 645140929957. The reversal of 645140929938 is 839929041546.

645140929938 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 (645140929931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 567106 + ... + 1269602.

It is an arithmetic number, because the mean of its divisors is an integer number (80643257910).

Almost surely, 2^645140929938 is an apocalyptic number.

645140929938 is an abundant number, since it is smaller than the sum of its proper divisors (645151196622).

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

645140929938 is a wasteful number, since it uses less digits than its factorization.

645140929938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855561.

The product of its (nonzero) digits is 16796160, while the sum is 60.

The spelling of 645140929938 in words is "six hundred forty-five billion, one hundred forty million, nine hundred twenty-nine thousand, nine hundred thirty-eight".