645100125120 has 168 divisors, whose sum is σ = 2420591724720. Its totient is φ = 156387901440.

The previous prime is 645100125083. The next prime is 645100125127. The reversal of 645100125120 is 21521001546.

645100125120 is a `hidden beast` number, since 6 + 4 + 510 + 0 + 1 + 25 + 120 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645100125127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10149825 + ... + 10213184.

Almost surely, 2^645100125120 is an apocalyptic number.

645100125120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645100125120 is an abundant number, since it is smaller than the sum of its proper divisors (1775491599600).

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

645100125120 is a wasteful number, since it uses less digits than its factorization.

645100125120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20363043 (or 20363030 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 645100125120 its reverse (21521001546), we get a palindrome (666621126666).

The spelling of 645100125120 in words is "six hundred forty-five billion, one hundred million, one hundred twenty-five thousand, one hundred twenty".