813725621643 has 32 divisors (see below), whose sum is σ = 1248670944000. Its totient is φ = 466170163200.

The previous prime is 813725621641. The next prime is 813725621669. The reversal of 813725621643 is 346126527318.

It is not a de Polignac number, because 813725621643 - 2¹ = 813725621641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 813725621592 and 813725621601.

It is not an unprimeable number, because it can be changed into a prime (813725621641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1163698 + ... + 1726743.

It is an arithmetic number, because the mean of its divisors is an integer number (39020967000).

Almost surely, 2^813725621643 is an apocalyptic number.

813725621643 is a deficient number, since it is larger than the sum of its proper divisors (434945322357).

813725621643 is a wasteful number, since it uses less digits than its factorization.

813725621643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2890923.

The product of its digits is 1451520, while the sum is 48.

The spelling of 813725621643 in words is "eight hundred thirteen billion, seven hundred twenty-five million, six hundred twenty-one thousand, six hundred forty-three".