116781505561 has 8 divisors (see below), whose sum is σ = 134097113024. Its totient is φ = 99624031920.

The previous prime is 116781505537. The next prime is 116781505639. The reversal of 116781505561 is 165505187611.

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

It is not a de Polignac number, because 116781505561 - 2¹³ = 116781497369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (116781502561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39531870 + ... + 39534823.

It is an arithmetic number, because the mean of its divisors is an integer number (16762139128).

Almost surely, 2^116781505561 is an apocalyptic number.

It is an amenable number.

116781505561 is a deficient number, since it is larger than the sum of its proper divisors (17315607463).

116781505561 is an equidigital number, since it uses as much as digits as its factorization.

116781505561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79066911.

The product of its (nonzero) digits is 252000, while the sum is 46.

The spelling of 116781505561 in words is "one hundred sixteen billion, seven hundred eighty-one million, five hundred five thousand, five hundred sixty-one".