116556216721 has 4 divisors (see below), whose sum is σ = 133207104832. Its totient is φ = 99905328612.

The previous prime is 116556216677. The next prime is 116556216743. The reversal of 116556216721 is 127612655611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-116556216721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (116556214721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8325444045 + ... + 8325444058.

It is an arithmetic number, because the mean of its divisors is an integer number (33301776208).

Almost surely, 2^116556216721 is an apocalyptic number.

It is an amenable number.

116556216721 is a deficient number, since it is larger than the sum of its proper divisors (16650888111).

116556216721 is an equidigital number, since it uses as much as digits as its factorization.

116556216721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16650888110.

The product of its digits is 151200, while the sum is 43.

The spelling of 116556216721 in words is "one hundred sixteen billion, five hundred fifty-six million, two hundred sixteen thousand, seven hundred twenty-one".