100553242561 has 2 divisors, whose sum is σ = 100553242562. Its totient is φ = 100553242560.

The previous prime is 100553242529. The next prime is 100553242577. The reversal of 100553242561 is 165242355001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69939091600 + 30614150961 = 264460^2 + 174969^2 .

It is a cyclic number.

It is not a de Polignac number, because 100553242561 - 2⁵ = 100553242529 is a prime.

It is a super-2 number, since 2×100553242561² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100553242501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50276621280 + 50276621281.

It is an arithmetic number, because the mean of its divisors is an integer number (50276621281).

Almost surely, 2^100553242561 is an apocalyptic number.

It is an amenable number.

100553242561 is a deficient number, since it is larger than the sum of its proper divisors (1).

100553242561 is an equidigital number, since it uses as much as digits as its factorization.

100553242561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 100553242561 its reverse (165242355001), we get a palindrome (265795597562).

The spelling of 100553242561 in words is "one hundred billion, five hundred fifty-three million, two hundred forty-two thousand, five hundred sixty-one".