1665056101 has 2 divisors, whose sum is σ = 1665056102. Its totient is φ = 1665056100.

The previous prime is 1665056093. The next prime is 1665056117. The reversal of 1665056101 is 1016505661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1530843876 + 134212225 = 39126^2 + 11585^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665056101 - 2³ = 1665056093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665056171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832528050 + 832528051.

It is an arithmetic number, because the mean of its divisors is an integer number (832528051).

Almost surely, 2^1665056101 is an apocalyptic number.

It is an amenable number.

1665056101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665056101 is an equidigital number, since it uses as much as digits as its factorization.

1665056101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1665056101 is about 40805.0989583410. The cubic root of 1665056101 is about 1185.2490710641.

The spelling of 1665056101 in words is "one billion, six hundred sixty-five million, fifty-six thousand, one hundred one".