1265321705 has 16 divisors (see below), whose sum is σ = 1556731008. Its totient is φ = 986736000.

The previous prime is 1265321657. The next prime is 1265321723. The reversal of 1265321705 is 5071235621.

It is not a de Polignac number, because 1265321705 - 2¹⁰ = 1265320681 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 373670 + ... + 377040.

It is an arithmetic number, because the mean of its divisors is an integer number (97295688).

Almost surely, 2^1265321705 is an apocalyptic number.

It is an amenable number.

1265321705 is a deficient number, since it is larger than the sum of its proper divisors (291409303).

1265321705 is a wasteful number, since it uses less digits than its factorization.

1265321705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5248.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1265321705 is about 35571.3607414729. The cubic root of 1265321705 is about 1081.6007654778.

The spelling of 1265321705 in words is "one billion, two hundred sixty-five million, three hundred twenty-one thousand, seven hundred five".