645254423125 has 40 divisors (see below), whose sum is σ = 868720295520. Its totient is φ = 476283480000.

The previous prime is 645254423123. The next prime is 645254423161. The reversal of 645254423125 is 521324452546.

It is not a de Polignac number, because 645254423125 - 2¹ = 645254423123 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645254423123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19572906 + ... + 19605844.

It is an arithmetic number, because the mean of its divisors is an integer number (21718007388).

Almost surely, 2^645254423125 is an apocalyptic number.

645254423125 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

645254423125 is a deficient number, since it is larger than the sum of its proper divisors (223465872395).

645254423125 is a wasteful number, since it uses less digits than its factorization.

645254423125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35383 (or 35368 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 43.

The spelling of 645254423125 in words is "six hundred forty-five billion, two hundred fifty-four million, four hundred twenty-three thousand, one hundred twenty-five".