81116121513 has 8 divisors (see below), whose sum is σ = 123605518528. Its totient is φ = 46352069424.

The previous prime is 81116121491. The next prime is 81116121517. The reversal of 81116121513 is 31512161118.

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

It is not a de Polignac number, because 81116121513 - 2⁸ = 81116121257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81116121517) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1931336206 + ... + 1931336247.

It is an arithmetic number, because the mean of its divisors is an integer number (15450689816).

Almost surely, 2^81116121513 is an apocalyptic number.

It is an amenable number.

81116121513 is a deficient number, since it is larger than the sum of its proper divisors (42489397015).

81116121513 is a wasteful number, since it uses less digits than its factorization.

81116121513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862672463.

The product of its digits is 1440, while the sum is 30.

The spelling of 81116121513 in words is "eighty-one billion, one hundred sixteen million, one hundred twenty-one thousand, five hundred thirteen".