1265005166 has 16 divisors (see below), whose sum is σ = 1939657104. Its totient is φ = 618531264.

The previous prime is 1265005151. The next prime is 1265005169. The reversal of 1265005166 is 6615005621.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265005169) 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 in 7 ways as a sum of consecutive naturals, for example, 13106 + ... + 51978.

It is an arithmetic number, because the mean of its divisors is an integer number (121228569).

Almost surely, 2^1265005166 is an apocalyptic number.

1265005166 is a deficient number, since it is larger than the sum of its proper divisors (674651938).

1265005166 is a wasteful number, since it uses less digits than its factorization.

1265005166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39235.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1265005166 is about 35566.9111113124. The cubic root of 1265005166 is about 1081.5105651287.

The spelling of 1265005166 in words is "one billion, two hundred sixty-five million, five thousand, one hundred sixty-six".