116220651661 has 2 divisors, whose sum is σ = 116220651662. Its totient is φ = 116220651660.

The previous prime is 116220651637. The next prime is 116220651697. The reversal of 116220651661 is 166156022611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100881829161 + 15338822500 = 317619^2 + 123850^2 .

It is a cyclic number.

It is not a de Polignac number, because 116220651661 - 2¹⁷ = 116220520589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 116220651661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116220651161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58110325830 + 58110325831.

It is an arithmetic number, because the mean of its divisors is an integer number (58110325831).

Almost surely, 2^116220651661 is an apocalyptic number.

It is an amenable number.

116220651661 is a deficient number, since it is larger than the sum of its proper divisors (1).

116220651661 is an equidigital number, since it uses as much as digits as its factorization.

116220651661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 116220651661 in words is "one hundred sixteen billion, two hundred twenty million, six hundred fifty-one thousand, six hundred sixty-one".