645237023068 has 96 divisors (see below), whose sum is σ = 1314221884416. Its totient is φ = 273936000000.

The previous prime is 645237023059. The next prime is 645237023069. The reversal of 645237023068 is 860320732546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645237023069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146943153 + ... + 146947543.

It is an arithmetic number, because the mean of its divisors is an integer number (13689811296).

Almost surely, 2^645237023068 is an apocalyptic number.

645237023068 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

645237023068 is an abundant number, since it is smaller than the sum of its proper divisors (668984861348).

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

645237023068 is a wasteful number, since it uses less digits than its factorization.

645237023068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5875 (or 5873 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 645237023068 in words is "six hundred forty-five billion, two hundred thirty-seven million, twenty-three thousand, sixty-eight".