101850805561 has 2 divisors, whose sum is σ = 101850805562. Its totient is φ = 101850805560.

The previous prime is 101850805541. The next prime is 101850805579. The reversal of 101850805561 is 165508058101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99754905600 + 2095899961 = 315840^2 + 45781^2 .

It is a cyclic number.

It is not a de Polignac number, because 101850805561 - 2²⁹ = 101313934649 is a prime.

It is not a weakly prime, because it can be changed into another prime (101850805541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50925402780 + 50925402781.

It is an arithmetic number, because the mean of its divisors is an integer number (50925402781).

Almost surely, 2^101850805561 is an apocalyptic number.

It is an amenable number.

101850805561 is a deficient number, since it is larger than the sum of its proper divisors (1).

101850805561 is an equidigital number, since it uses as much as digits as its factorization.

101850805561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48000, while the sum is 40.

The spelling of 101850805561 in words is "one hundred one billion, eight hundred fifty million, eight hundred five thousand, five hundred sixty-one".