815138188269 has 32 divisors (see below), whose sum is σ = 1101725439360. Its totient is φ = 536027922432.

The previous prime is 815138188261. The next prime is 815138188321. The reversal of 815138188269 is 962881831518.

It is not a de Polignac number, because 815138188269 - 2³ = 815138188261 is a prime.

It is a super-2 number, since 2×815138188269² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815138188261) 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 31 ways as a sum of consecutive naturals, for example, 235791789 + ... + 235795245.

It is an arithmetic number, because the mean of its divisors is an integer number (34428919980).

Almost surely, 2^815138188269 is an apocalyptic number.

It is an amenable number.

815138188269 is a deficient number, since it is larger than the sum of its proper divisors (286587251091).

815138188269 is a wasteful number, since it uses less digits than its factorization.

815138188269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6029.

The product of its digits is 6635520, while the sum is 60.

The spelling of 815138188269 in words is "eight hundred fifteen billion, one hundred thirty-eight million, one hundred eighty-eight thousand, two hundred sixty-nine".