643158202901 has 4 divisors (see below), whose sum is σ = 656842420032. Its totient is φ = 629473985772.

The previous prime is 643158202867. The next prime is 643158202919. The reversal of 643158202901 is 109202851346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643158202901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643158502901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6842108495 + ... + 6842108588.

It is an arithmetic number, because the mean of its divisors is an integer number (164210605008).

Almost surely, 2^643158202901 is an apocalyptic number.

It is an amenable number.

643158202901 is a deficient number, since it is larger than the sum of its proper divisors (13684217131).

643158202901 is a wasteful number, since it uses less digits than its factorization.

643158202901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13684217130.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 643158202901 in words is "six hundred forty-three billion, one hundred fifty-eight million, two hundred two thousand, nine hundred one".