101666563 has 2 divisors, whose sum is σ = 101666564. Its totient is φ = 101666562.

The previous prime is 101666557. The next prime is 101666603. The reversal of 101666563 is 365666101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101666563 - 2⁹ = 101666051 is a prime.

It is not a weakly prime, because it can be changed into another prime (101666503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50833281 + 50833282.

It is an arithmetic number, because the mean of its divisors is an integer number (50833282).

Almost surely, 2^101666563 is an apocalyptic number.

101666563 is a deficient number, since it is larger than the sum of its proper divisors (1).

101666563 is an equidigital number, since it uses as much as digits as its factorization.

101666563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 101666563 is about 10082.9838341634. The cubic root of 101666563 is about 466.7231904890.

The spelling of 101666563 in words is "one hundred one million, six hundred sixty-six thousand, five hundred sixty-three".