815913830495281 has 6 divisors (see below), whose sum is σ = 949124251800690. Its totient is φ = 699354711853056.

The previous prime is 815913830495249. The next prime is 815913830495287. The reversal of 815913830495281 is 182594038319518.

It can be written as a sum of positive squares in only one way, i.e., 548637631690225 + 267276198805056 = 23423015^2 + 16348584^2 .

It is not a de Polignac number, because 815913830495281 - 2⁵ = 815913830495249 is a prime.

It is a super-2 number, since 2×815913830495281² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (815913830495287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8325651331536 + ... + 8325651331633.

It is an arithmetic number, because the mean of its divisors is an integer number (158187375300115).

Almost surely, 2^{815913830495281} is an apocalyptic number.

It is an amenable number.

815913830495281 is a deficient number, since it is larger than the sum of its proper divisors (133210421305409).

815913830495281 is a wasteful number, since it uses less digits than its factorization.

815913830495281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16651302663183 (or 16651302663176 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 67.

The spelling of 815913830495281 in words is "eight hundred fifteen trillion, nine hundred thirteen billion, eight hundred thirty million, four hundred ninety-five thousand, two hundred eighty-one".