643465201525 has 48 divisors (see below), whose sum is σ = 832013712000. Its totient is φ = 493060296960.

The previous prime is 643465201523. The next prime is 643465201529. The reversal of 643465201525 is 525102564346.

It is not a de Polignac number, because 643465201525 - 2¹ = 643465201523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643465201523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50056999 + ... + 50069851.

It is an arithmetic number, because the mean of its divisors is an integer number (17333619000).

Almost surely, 2^643465201525 is an apocalyptic number.

It is an amenable number.

643465201525 is a deficient number, since it is larger than the sum of its proper divisors (188548510475).

643465201525 is a wasteful number, since it uses less digits than its factorization.

643465201525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13438 (or 13433 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 643465201525 in words is "six hundred forty-three billion, four hundred sixty-five million, two hundred one thousand, five hundred twenty-five".