645204146125 has 32 divisors (see below), whose sum is σ = 1003904149248. Its totient is φ = 402205176000.

The previous prime is 645204146123. The next prime is 645204146159. The reversal of 645204146125 is 521641402546.

It is not a de Polignac number, because 645204146125 - 2¹ = 645204146123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645204146123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33507474 + ... + 33526723.

It is an arithmetic number, because the mean of its divisors is an integer number (31372004664).

Almost surely, 2^645204146125 is an apocalyptic number.

It is an amenable number.

645204146125 is a deficient number, since it is larger than the sum of its proper divisors (358700003123).

645204146125 is a wasteful number, since it uses less digits than its factorization.

645204146125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67034230 (or 67034220 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 645204146125 in words is "six hundred forty-five billion, two hundred four million, one hundred forty-six thousand, one hundred twenty-five".