289445976661 has 2 divisors, whose sum is σ = 289445976662. Its totient is φ = 289445976660.

The previous prime is 289445976653. The next prime is 289445976727. The reversal of 289445976661 is 166679544982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 285487176100 + 3958800561 = 534310^2 + 62919^2 .

It is a cyclic number.

It is not a de Polignac number, because 289445976661 - 2³ = 289445976653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289445976641) 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, 144722988330 + 144722988331.

It is an arithmetic number, because the mean of its divisors is an integer number (144722988331).

Almost surely, 2^289445976661 is an apocalyptic number.

It is an amenable number.

289445976661 is a deficient number, since it is larger than the sum of its proper divisors (1).

289445976661 is an equidigital number, since it uses as much as digits as its factorization.

289445976661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156764160, while the sum is 67.

The spelling of 289445976661 in words is "two hundred eighty-nine billion, four hundred forty-five million, nine hundred seventy-six thousand, six hundred sixty-one".