815457925558081 has 4 divisors (see below), whose sum is σ = 878185458293332. Its totient is φ = 752730392822832.

The previous prime is 815457925558069. The next prime is 815457925558103. The reversal of 815457925558081 is 180855529754518.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 211754155650625 + 603703769907456 = 14551775^2 + 24570384^2 .

It is a cyclic number.

It is not a de Polignac number, because 815457925558081 - 2⁵ = 815457925558049 is a prime.

It is a super-2 number, since 2×815457925558081² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 815457925557995 and 815457925558013.

It is not an unprimeable number, because it can be changed into a prime (815457925558021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31363766367606 + ... + 31363766367631.

It is an arithmetic number, because the mean of its divisors is an integer number (219546364573333).

Almost surely, 2^{815457925558081} is an apocalyptic number.

It is an amenable number.

815457925558081 is a deficient number, since it is larger than the sum of its proper divisors (62727532735251).

815457925558081 is a wasteful number, since it uses less digits than its factorization.

815457925558081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62727532735250.

The product of its (nonzero) digits is 806400000, while the sum is 73.

The spelling of 815457925558081 in words is "eight hundred fifteen trillion, four hundred fifty-seven billion, nine hundred twenty-five million, five hundred fifty-eight thousand, eighty-one".