645112540140 has 48 divisors (see below), whose sum is σ = 1864583347200. Its totient is φ = 166480655040.

The previous prime is 645112540099. The next prime is 645112540151. The reversal of 645112540140 is 41045211546.

It is a super-2 number, since 2×645112540140² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173415490 + ... + 173419209.

It is an arithmetic number, because the mean of its divisors is an integer number (38845486400).

Almost surely, 2^645112540140 is an apocalyptic number.

645112540140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645112540140 is an abundant number, since it is smaller than the sum of its proper divisors (1219470807060).

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

645112540140 is a wasteful number, since it uses less digits than its factorization.

645112540140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346834742 (or 346834740 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 645112540140 its reverse (41045211546), we get a palindrome (686157751686).

The spelling of 645112540140 in words is "six hundred forty-five billion, one hundred twelve million, five hundred forty thousand, one hundred forty".