813761640764 has 12 divisors (see below), whose sum is σ = 1424186244600. Its totient is φ = 406851285168.

The previous prime is 813761640751. The next prime is 813761640863. The reversal of 813761640764 is 467046167318.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7321754 + ... + 7432065.

It is an arithmetic number, because the mean of its divisors is an integer number (118682187050).

Almost surely, 2^813761640764 is an apocalyptic number.

It is an amenable number.

813761640764 is a deficient number, since it is larger than the sum of its proper divisors (610424603836).

813761640764 is a wasteful number, since it uses less digits than its factorization.

813761640764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14767612 (or 14767610 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 53.

The spelling of 813761640764 in words is "eight hundred thirteen billion, seven hundred sixty-one million, six hundred forty thousand, seven hundred sixty-four".