645116574 has 16 divisors (see below), whose sum is σ = 1300083840. Its totient is φ = 213397080.

The previous prime is 645116569. The next prime is 645116597. The reversal of 645116574 is 475611546.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 409594 + ... + 411165.

It is an arithmetic number, because the mean of its divisors is an integer number (81255240).

Almost surely, 2^645116574 is an apocalyptic number.

645116574 is an abundant number, since it is smaller than the sum of its proper divisors (654967266).

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

645116574 is a wasteful number, since it uses less digits than its factorization.

645116574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820895.

The product of its digits is 100800, while the sum is 39.

The square root of 645116574 is about 25399.1451430949. The cubic root of 645116574 is about 864.0643090207.

The spelling of 645116574 in words is "six hundred forty-five million, one hundred sixteen thousand, five hundred seventy-four".