815180805157 has 8 divisors (see below), whose sum is σ = 858110054400. Its totient is φ = 772254055584.

The previous prime is 815180805143. The next prime is 815180805167. The reversal of 815180805157 is 751508081518.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 815180805157 - 2¹⁹ = 815180280869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 815180805157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815180805107) 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 7 ways as a sum of consecutive naturals, for example, 63969 + ... + 1278457.

It is an arithmetic number, because the mean of its divisors is an integer number (107263756800).

Almost surely, 2^815180805157 is an apocalyptic number.

It is an amenable number.

815180805157 is a deficient number, since it is larger than the sum of its proper divisors (42929249243).

815180805157 is a wasteful number, since it uses less digits than its factorization.

815180805157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249835.

The product of its (nonzero) digits is 448000, while the sum is 49.

The spelling of 815180805157 in words is "eight hundred fifteen billion, one hundred eighty million, eight hundred five thousand, one hundred fifty-seven".