101165615561 has 2 divisors, whose sum is σ = 101165615562. Its totient is φ = 101165615560.

The previous prime is 101165615533. The next prime is 101165615591. The reversal of 101165615561 is 165516561101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99171457225 + 1994158336 = 314915^2 + 44656^2 .

It is an emirp because it is prime and its reverse (165516561101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101165615561 - 2⁶ = 101165615497 is a prime.

It is not a weakly prime, because it can be changed into another prime (101165615531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50582807780 + 50582807781.

It is an arithmetic number, because the mean of its divisors is an integer number (50582807781).

Almost surely, 2^101165615561 is an apocalyptic number.

It is an amenable number.

101165615561 is a deficient number, since it is larger than the sum of its proper divisors (1).

101165615561 is an equidigital number, since it uses as much as digits as its factorization.

101165615561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 101165615561 in words is "one hundred one billion, one hundred sixty-five million, six hundred fifteen thousand, five hundred sixty-one".