815380325816 has 32 divisors (see below), whose sum is σ = 1749356403840. Its totient is φ = 349026141408.

The previous prime is 815380325789. The next prime is 815380325821. The reversal of 815380325816 is 618523083518.

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 7 ways as a sum of consecutive naturals, for example, 8756810 + ... + 8849433.

It is an arithmetic number, because the mean of its divisors is an integer number (54667387620).

Almost surely, 2^815380325816 is an apocalyptic number.

It is an amenable number.

815380325816 is an abundant number, since it is smaller than the sum of its proper divisors (933976078024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

815380325816 is a wasteful number, since it uses less digits than its factorization.

815380325816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17607083 (or 17607079 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 815380325816 in words is "eight hundred fifteen billion, three hundred eighty million, three hundred twenty-five thousand, eight hundred sixteen".