1659105881 has 2 divisors, whose sum is σ = 1659105882. Its totient is φ = 1659105880.

The previous prime is 1659105857. The next prime is 1659105883. The reversal of 1659105881 is 1885019561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 941937481 + 717168400 = 30691^2 + 26780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1659105881 - 2⁶ = 1659105817 is a prime.

It is a super-2 number, since 2×1659105881² = 5505264648737572322, which contains 22 as substring.

Together with 1659105883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1659105883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829552940 + 829552941.

It is an arithmetic number, because the mean of its divisors is an integer number (829552941).

Almost surely, 2^1659105881 is an apocalyptic number.

It is an amenable number.

1659105881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659105881 is an equidigital number, since it uses as much as digits as its factorization.

1659105881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 44.

The square root of 1659105881 is about 40732.1234531174. The cubic root of 1659105881 is about 1183.8355230288.

The spelling of 1659105881 in words is "one billion, six hundred fifty-nine million, one hundred five thousand, eight hundred eighty-one".