815138188268 has 6 divisors (see below), whose sum is σ = 1426491829476. Its totient is φ = 407569094132.

The previous prime is 815138188261. The next prime is 815138188321. The reversal of 815138188268 is 862881831518.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (815138188261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101892273530 + ... + 101892273537.

It is an arithmetic number, because the mean of its divisors is an integer number (237748638246).

Almost surely, 2^815138188268 is an apocalyptic number.

It is an amenable number.

815138188268 is a deficient number, since it is larger than the sum of its proper divisors (611353641208).

815138188268 is a wasteful number, since it uses less digits than its factorization.

815138188268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203784547071 (or 203784547069 counting only the distinct ones).

The product of its digits is 5898240, while the sum is 59.

The spelling of 815138188268 in words is "eight hundred fifteen billion, one hundred thirty-eight million, one hundred eighty-eight thousand, two hundred sixty-eight".