100520661161 has 2 divisors, whose sum is σ = 100520661162. Its totient is φ = 100520661160.

The previous prime is 100520661127. The next prime is 100520661169. The reversal of 100520661161 is 161166025001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53856020761 + 46664640400 = 232069^2 + 216020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100520661161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (100520661169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50260330580 + 50260330581.

It is an arithmetic number, because the mean of its divisors is an integer number (50260330581).

Almost surely, 2^100520661161 is an apocalyptic number.

It is an amenable number.

100520661161 is a deficient number, since it is larger than the sum of its proper divisors (1).

100520661161 is an equidigital number, since it uses as much as digits as its factorization.

100520661161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 100520661161 its reverse (161166025001), we get a palindrome (261686686162).

The spelling of 100520661161 in words is "one hundred billion, five hundred twenty million, six hundred sixty-one thousand, one hundred sixty-one".