643464253025 has 24 divisors (see below), whose sum is σ = 883423186464. Its totient is φ = 460989302400.

The previous prime is 643464253001. The next prime is 643464253067. The reversal of 643464253025 is 520352464346.

643464253025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643464253025 - 2³⁰ = 642390511201 is a prime.

It is a super-3 number, since 3×643464253025³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17443292 + ... + 17480141.

It is an arithmetic number, because the mean of its divisors is an integer number (36809299436).

Almost surely, 2^643464253025 is an apocalyptic number.

It is an amenable number.

643464253025 is a deficient number, since it is larger than the sum of its proper divisors (239958933439).

643464253025 is a wasteful number, since it uses less digits than its factorization.

643464253025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34923521 (or 34923516 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 44.

The spelling of 643464253025 in words is "six hundred forty-three billion, four hundred sixty-four million, two hundred fifty-three thousand, twenty-five".