100005055561 has 2 divisors, whose sum is σ = 100005055562. Its totient is φ = 100005055560.

The previous prime is 100005055537. The next prime is 100005055583. The reversal of 100005055561 is 165550500001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57783025161 + 42222030400 = 240381^2 + 205480^2 .

It is a cyclic number.

It is not a de Polignac number, because 100005055561 - 2⁵ = 100005055529 is a prime.

It is a super-2 number, since 2×100005055561² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100005055531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50002527780 + 50002527781.

It is an arithmetic number, because the mean of its divisors is an integer number (50002527781).

Almost surely, 2^100005055561 is an apocalyptic number.

It is an amenable number.

100005055561 is a deficient number, since it is larger than the sum of its proper divisors (1).

100005055561 is an equidigital number, since it uses as much as digits as its factorization.

100005055561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3750, while the sum is 28.

Adding to 100005055561 its reverse (165550500001), we get a palindrome (265555555562).

The spelling of 100005055561 in words is "one hundred billion, five million, fifty-five thousand, five hundred sixty-one".