645325757 has 4 divisors (see below), whose sum is σ = 648568800. Its totient is φ = 642082716.

The previous prime is 645325741. The next prime is 645325787. The reversal of 645325757 is 757523546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645325757 - 2⁴ = 645325741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645325787) 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 3 ways as a sum of consecutive naturals, for example, 1621223 + ... + 1621620.

It is an arithmetic number, because the mean of its divisors is an integer number (162142200).

Almost surely, 2^645325757 is an apocalyptic number.

It is an amenable number.

645325757 is a deficient number, since it is larger than the sum of its proper divisors (3243043).

645325757 is a wasteful number, since it uses less digits than its factorization.

645325757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243042.

The product of its digits is 882000, while the sum is 44.

The square root of 645325757 is about 25403.2627235164. The cubic root of 645325757 is about 864.1576916428.

The spelling of 645325757 in words is "six hundred forty-five million, three hundred twenty-five thousand, seven hundred fifty-seven".