261667673 has 2 divisors, whose sum is σ = 261667674. Its totient is φ = 261667672.

The previous prime is 261667657. The next prime is 261667717. The reversal of 261667673 is 376766162.

It is an a-pointer prime, because the next prime (261667717) can be obtained adding 261667673 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261242569 + 425104 = 16163^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 261667673 - 2⁴ = 261667657 is a prime.

It is not a weakly prime, because it can be changed into another prime (261667603) 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, 130833836 + 130833837.

It is an arithmetic number, because the mean of its divisors is an integer number (130833837).

Almost surely, 2^261667673 is an apocalyptic number.

It is an amenable number.

261667673 is a deficient number, since it is larger than the sum of its proper divisors (1).

261667673 is an equidigital number, since it uses as much as digits as its factorization.

261667673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 44.

The square root of 261667673 is about 16176.1451835720. The cubic root of 261667673 is about 639.6121290740.

The spelling of 261667673 in words is "two hundred sixty-one million, six hundred sixty-seven thousand, six hundred seventy-three".