265201666655551 has 2 divisors, whose sum is σ = 265201666655552. Its totient is φ = 265201666655550.

The previous prime is 265201666655483. The next prime is 265201666655579. The reversal of 265201666655551 is 155556666102562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265201666655551 - 2²⁹ = 265201129784639 is a prime.

It is a super-2 number, since 2×265201666655551² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 265201666655551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265201666655351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132600833327775 + 132600833327776.

It is an arithmetic number, because the mean of its divisors is an integer number (132600833327776).

Almost surely, 2^{265201666655551} is an apocalyptic number.

265201666655551 is a deficient number, since it is larger than the sum of its proper divisors (1).

265201666655551 is an equidigital number, since it uses as much as digits as its factorization.

265201666655551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200000, while the sum is 61.

The spelling of 265201666655551 in words is "two hundred sixty-five trillion, two hundred one billion, six hundred sixty-six million, six hundred fifty-five thousand, five hundred fifty-one".