645125611 has 16 divisors (see below), whose sum is σ = 715534848. Its totient is φ = 577843200.

The previous prime is 645125609. The next prime is 645125617. The reversal of 645125611 is 116521546.

It is a cyclic number.

It is not a de Polignac number, because 645125611 - 2¹ = 645125609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645125617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98635 + ... + 104971.

It is an arithmetic number, because the mean of its divisors is an integer number (44720928).

Almost surely, 2^645125611 is an apocalyptic number.

645125611 is a deficient number, since it is larger than the sum of its proper divisors (70409237).

645125611 is a wasteful number, since it uses less digits than its factorization.

645125611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6582.

The product of its digits is 7200, while the sum is 31.

The square root of 645125611 is about 25399.3230421600. The cubic root of 645125611 is about 864.0683436986.

The spelling of 645125611 in words is "six hundred forty-five million, one hundred twenty-five thousand, six hundred eleven".