813785861744 has 40 divisors (see below), whose sum is σ = 1586343467520. Its totient is φ = 404407494848.

The previous prime is 813785861743. The next prime is 813785861783. The reversal of 813785861744 is 447168587318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813785861743) 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 7 ways as a sum of consecutive naturals, for example, 33395837 + ... + 33420195.

It is an arithmetic number, because the mean of its divisors is an integer number (39658586688).

Almost surely, 2^813785861744 is an apocalyptic number.

It is an amenable number.

813785861744 is a deficient number, since it is larger than the sum of its proper divisors (772557605776).

813785861744 is a wasteful number, since it uses less digits than its factorization.

813785861744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37037 (or 37031 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 62.

The spelling of 813785861744 in words is "eight hundred thirteen billion, seven hundred eighty-five million, eight hundred sixty-one thousand, seven hundred forty-four".