643252525 has 12 divisors (see below), whose sum is σ = 798011424. Its totient is φ = 514358000.

The previous prime is 643252471. The next prime is 643252541. The reversal of 643252525 is 525252346.

It is not a de Polignac number, because 643252525 - 2¹³ = 643244333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63030 + ... + 72520.

It is an arithmetic number, because the mean of its divisors is an integer number (66500952).

Almost surely, 2^643252525 is an apocalyptic number.

It is an amenable number.

643252525 is a deficient number, since it is larger than the sum of its proper divisors (154758899).

643252525 is a wasteful number, since it uses less digits than its factorization.

643252525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12212 (or 12207 counting only the distinct ones).

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

The square root of 643252525 is about 25362.4234843597. The cubic root of 643252525 is about 863.2312750695.

The spelling of 643252525 in words is "six hundred forty-three million, two hundred fifty-two thousand, five hundred twenty-five".