813725621642 has 8 divisors (see below), whose sum is σ = 1273657494816. Its totient is φ = 389173123372.

The previous prime is 813725621641. The next prime is 813725621669. The reversal of 813725621642 is 246126527318.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 8844843668 + ... + 8844843759.

It is an arithmetic number, because the mean of its divisors is an integer number (159207186852).

Almost surely, 2^813725621642 is an apocalyptic number.

813725621642 is a deficient number, since it is larger than the sum of its proper divisors (459931873174).

813725621642 is a wasteful number, since it uses less digits than its factorization.

813725621642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17689687452.

The product of its digits is 967680, while the sum is 47.

The spelling of 813725621642 in words is "eight hundred thirteen billion, seven hundred twenty-five million, six hundred twenty-one thousand, six hundred forty-two".