643523325345 has 128 divisors (see below), whose sum is σ = 1200625873920. Its totient is φ = 326414499840.

The previous prime is 643523325337. The next prime is 643523325421. The reversal of 643523325345 is 543523325346.

643523325345 is a `hidden beast` number, since 6 + 4 + 3 + 523 + 32 + 53 + 45 = 666.

It is not a de Polignac number, because 643523325345 - 2³ = 643523325337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 643523325345.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 622964949 + ... + 622965981.

It is an arithmetic number, because the mean of its divisors is an integer number (9379889640).

Almost surely, 2^643523325345 is an apocalyptic number.

It is an amenable number.

643523325345 is a deficient number, since it is larger than the sum of its proper divisors (557102548575).

643523325345 is a wasteful number, since it uses less digits than its factorization.

643523325345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024 (or 2018 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 45.

Subtracting from 643523325345 its reverse (543523325346), we obtain a palindrome (99999999999).

The spelling of 643523325345 in words is "six hundred forty-three billion, five hundred twenty-three million, three hundred twenty-five thousand, three hundred forty-five".