101550616561 has 2 divisors, whose sum is σ = 101550616562. Its totient is φ = 101550616560.

The previous prime is 101550616553. The next prime is 101550616691. The reversal of 101550616561 is 165616055101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74464040161 + 27086576400 = 272881^2 + 164580^2 .

It is a cyclic number.

It is not a de Polignac number, because 101550616561 - 2³ = 101550616553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101550616561.

It is not a weakly prime, because it can be changed into another prime (101550617561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50775308280 + 50775308281.

It is an arithmetic number, because the mean of its divisors is an integer number (50775308281).

Almost surely, 2^101550616561 is an apocalyptic number.

It is an amenable number.

101550616561 is a deficient number, since it is larger than the sum of its proper divisors (1).

101550616561 is an equidigital number, since it uses as much as digits as its factorization.

101550616561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 101550616561 in words is "one hundred one billion, five hundred fifty million, six hundred sixteen thousand, five hundred sixty-one".