115581623558 has 4 divisors (see below), whose sum is σ = 173372435340. Its totient is φ = 57790811778.

The previous prime is 115581623537. The next prime is 115581623581. The reversal of 115581623558 is 855326185511.

It is a happy number.

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

It is a super-2 number, since 2×115581623558² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28895405888 + ... + 28895405891.

It is an arithmetic number, because the mean of its divisors is an integer number (43343108835).

Almost surely, 2^115581623558 is an apocalyptic number.

115581623558 is a deficient number, since it is larger than the sum of its proper divisors (57790811782).

115581623558 is an equidigital number, since it uses as much as digits as its factorization.

115581623558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57790811781.

The product of its digits is 1440000, while the sum is 50.

The spelling of 115581623558 in words is "one hundred fifteen billion, five hundred eighty-one million, six hundred twenty-three thousand, five hundred fifty-eight".