643255525 has 48 divisors (see below), whose sum is σ = 912441600. Its totient is φ = 445536000.

The previous prime is 643255493. The next prime is 643255531. The reversal of 643255525 is 525552346.

It is not a de Polignac number, because 643255525 - 2⁵ = 643255493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 629515 + ... + 630535.

It is an arithmetic number, because the mean of its divisors is an integer number (19009200).

Almost surely, 2^643255525 is an apocalyptic number.

It is an amenable number.

643255525 is a deficient number, since it is larger than the sum of its proper divisors (269186075).

643255525 is a wasteful number, since it uses less digits than its factorization.

643255525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150 (or 1145 counting only the distinct ones).

The product of its digits is 180000, while the sum is 37.

The square root of 643255525 is about 25362.4826269039. The cubic root of 643255525 is about 863.2326170463.

The spelling of 643255525 in words is "six hundred forty-three million, two hundred fifty-five thousand, five hundred twenty-five".