815821941268 has 24 divisors (see below), whose sum is σ = 1471691555712. Its totient is φ = 395500863744.

The previous prime is 815821941241. The next prime is 815821941299. The reversal of 815821941268 is 862149128518.

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, 20257821 + ... + 20298052.

It is an arithmetic number, because the mean of its divisors is an integer number (61320481488).

Almost surely, 2^815821941268 is an apocalyptic number.

It is an amenable number.

815821941268 is a deficient number, since it is larger than the sum of its proper divisors (655869614444).

815821941268 is a wasteful number, since it uses less digits than its factorization.

815821941268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40556031 (or 40556029 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 55.

The spelling of 815821941268 in words is "eight hundred fifteen billion, eight hundred twenty-one million, nine hundred forty-one thousand, two hundred sixty-eight".