81115158513 has 16 divisors (see below), whose sum is σ = 109674230400. Its totient is φ = 53321728896.

The previous prime is 81115158463. The next prime is 81115158547. The reversal of 81115158513 is 31585151118.

It is not a de Polignac number, because 81115158513 - 2⁹ = 81115158001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81115158563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 601045 + ... + 723522.

It is an arithmetic number, because the mean of its divisors is an integer number (6854639400).

Almost surely, 2^81115158513 is an apocalyptic number.

It is an amenable number.

81115158513 is a deficient number, since it is larger than the sum of its proper divisors (28559071887).

81115158513 is a wasteful number, since it uses less digits than its factorization.

81115158513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324856.

The product of its digits is 24000, while the sum is 39.

The spelling of 81115158513 in words is "eighty-one billion, one hundred fifteen million, one hundred fifty-eight thousand, five hundred thirteen".