645345025 has 12 divisors (see below), whose sum is σ = 861784252. Its totient is φ = 476562240.

The previous prime is 645345023. The next prime is 645345031. The reversal of 645345025 is 520543546.

645345025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 61591104 + 583753921 = 7848^2 + 24161^2 .

It is not a de Polignac number, because 645345025 - 2¹ = 645345023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645345023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 992514 + ... + 993163.

Almost surely, 2^645345025 is an apocalyptic number.

645345025 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

645345025 is a deficient number, since it is larger than the sum of its proper divisors (216439227).

645345025 is a wasteful number, since it uses less digits than its factorization.

645345025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985700 (or 1985695 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The square root of 645345025 is about 25403.6419633091. The cubic root of 645345025 is about 864.1662921697.

The spelling of 645345025 in words is "six hundred forty-five million, three hundred forty-five thousand, twenty-five".