105665551 has 2 divisors, whose sum is σ = 105665552. Its totient is φ = 105665550.

The previous prime is 105665543. The next prime is 105665587. The reversal of 105665551 is 155566501.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 105665551 - 2³ = 105665543 is a prime.

It is a super-3 number, since 3×105665551³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105665501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52832775 + 52832776.

It is an arithmetic number, because the mean of its divisors is an integer number (52832776).

Almost surely, 2^105665551 is an apocalyptic number.

105665551 is a deficient number, since it is larger than the sum of its proper divisors (1).

105665551 is an equidigital number, since it uses as much as digits as its factorization.

105665551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 105665551 is about 10279.3750296407. The cubic root of 105665551 is about 472.7640821940.

The spelling of 105665551 in words is "one hundred five million, six hundred sixty-five thousand, five hundred fifty-one".