643653153125523 has 24 divisors (see below), whose sum is σ = 960872702939136. Its totient is φ = 414757970348400.

The previous prime is 643653153125513. The next prime is 643653153125539. The reversal of 643653153125523 is 325521351356346.

643653153125523 is a `hidden beast` number, since 6 + 4 + 3 + 6 + 5 + 31 + 53 + 1 + 2 + 552 + 3 = 666.

It is not a de Polignac number, because 643653153125523 - 2⁵ = 643653153125491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643653153125523.

It is not an unprimeable number, because it can be changed into a prime (643653153125513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1394570083 + ... + 1395031548.

It is an arithmetic number, because the mean of its divisors is an integer number (40036362622464).

Almost surely, 2^{643653153125523} is an apocalyptic number.

643653153125523 is a deficient number, since it is larger than the sum of its proper divisors (317219549813613).

643653153125523 is a wasteful number, since it uses less digits than its factorization.

643653153125523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789602495 (or 2789602492 counting only the distinct ones).

The product of its digits is 29160000, while the sum is 54.

The spelling of 643653153125523 in words is "six hundred forty-three trillion, six hundred fifty-three billion, one hundred fifty-three million, one hundred twenty-five thousand, five hundred twenty-three".