645541125 has 64 divisors (see below), whose sum is σ = 1105228800. Its totient is φ = 334497600.

The previous prime is 645541121. The next prime is 645541129. The reversal of 645541125 is 521145546.

It is an interprime number because it is at equal distance from previous prime (645541121) and next prime (645541129).

It is not a de Polignac number, because 645541125 - 2² = 645541121 is a prime.

It is a super-3 number, since 3×645541125³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645541121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3606286 + ... + 3606464.

It is an arithmetic number, because the mean of its divisors is an integer number (17269200).

Almost surely, 2^645541125 is an apocalyptic number.

It is an amenable number.

645541125 is a deficient number, since it is larger than the sum of its proper divisors (459687675).

645541125 is a wasteful number, since it uses less digits than its factorization.

645541125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 409 counting only the distinct ones).

The product of its digits is 24000, while the sum is 33.

The square root of 645541125 is about 25407.5013529469. The cubic root of 645541125 is about 864.2538142659.

The spelling of 645541125 in words is "six hundred forty-five million, five hundred forty-one thousand, one hundred twenty-five".