261665001633367 has 2 divisors, whose sum is σ = 261665001633368. Its totient is φ = 261665001633366.

The previous prime is 261665001633341. The next prime is 261665001633377. The reversal of 261665001633367 is 763336100566162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261665001633367 - 2⁷ = 261665001633239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261665001633317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130832500816683 + 130832500816684.

It is an arithmetic number, because the mean of its divisors is an integer number (130832500816684).

Almost surely, 2^{261665001633367} is an apocalyptic number.

261665001633367 is a deficient number, since it is larger than the sum of its proper divisors (1).

261665001633367 is an equidigital number, since it uses as much as digits as its factorization.

261665001633367 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14696640, while the sum is 55.

The spelling of 261665001633367 in words is "two hundred sixty-one trillion, six hundred sixty-five billion, one million, six hundred thirty-three thousand, three hundred sixty-seven".