101666051550517 has 2 divisors, whose sum is σ = 101666051550518. Its totient is φ = 101666051550516.

The previous prime is 101666051550487. The next prime is 101666051550533. The reversal of 101666051550517 is 715055150666101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101644183351876 + 21868198641 = 10081874^2 + 147879^2 .

It is a cyclic number.

It is not a de Polignac number, because 101666051550517 - 2³⁵ = 101631691812149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101666051557517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50833025775258 + 50833025775259.

It is an arithmetic number, because the mean of its divisors is an integer number (50833025775259).

Almost surely, 2^{101666051550517} is an apocalyptic number.

It is an amenable number.

101666051550517 is a deficient number, since it is larger than the sum of its proper divisors (1).

101666051550517 is an equidigital number, since it uses as much as digits as its factorization.

101666051550517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 945000, while the sum is 49.

The spelling of 101666051550517 in words is "one hundred one trillion, six hundred sixty-six billion, fifty-one million, five hundred fifty thousand, five hundred seventeen".