1266265005 has 32 divisors (see below), whose sum is σ = 2064082176. Its totient is φ = 662774784.

The previous prime is 1266265003. The next prime is 1266265037. The reversal of 1266265005 is 5005626621.

It is a happy number.

It is not a de Polignac number, because 1266265005 - 2¹ = 1266265003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266265001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170959 + ... + 178211.

It is an arithmetic number, because the mean of its divisors is an integer number (64502568).

Almost surely, 2^1266265005 is an apocalyptic number.

1266265005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1266265005 is a deficient number, since it is larger than the sum of its proper divisors (797817171).

1266265005 is a wasteful number, since it uses less digits than its factorization.

1266265005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7477.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1266265005 is about 35584.6175334231. The cubic root of 1266265005 is about 1081.8694772644.

The spelling of 1266265005 in words is "one billion, two hundred sixty-six million, two hundred sixty-five thousand, five".