1165550655551 has 2 divisors, whose sum is σ = 1165550655552. Its totient is φ = 1165550655550.

The previous prime is 1165550655491. The next prime is 1165550655587. The reversal of 1165550655551 is 1555560555611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1165550655551 - 2²⁶ = 1165483546687 is a prime.

It is a super-2 number, since 2×1165550655551² (a number of 25 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 1165550655551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165550655151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582775327775 + 582775327776.

It is an arithmetic number, because the mean of its divisors is an integer number (582775327776).

Almost surely, 2^{1165550655551} is an apocalyptic number.

1165550655551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165550655551 is an equidigital number, since it uses as much as digits as its factorization.

1165550655551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2812500, while the sum is 50.

The spelling of 1165550655551 in words is "one trillion, one hundred sixty-five billion, five hundred fifty million, six hundred fifty-five thousand, five hundred fifty-one".