775705665 has 64 divisors (see below), whose sum is σ = 1522699776. Its totient is φ = 329121792.

The previous prime is 775705643. The next prime is 775705729. The reversal of 775705665 is 566507577.

It is not a de Polignac number, because 775705665 - 2¹⁵ = 775672897 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 127329 + ... + 133281.

It is an arithmetic number, because the mean of its divisors is an integer number (23792184).

Almost surely, 2^775705665 is an apocalyptic number.

It is an amenable number.

775705665 is a deficient number, since it is larger than the sum of its proper divisors (746994111).

775705665 is a wasteful number, since it uses less digits than its factorization.

775705665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6058.

The product of its (nonzero) digits is 1543500, while the sum is 48.

The square root of 775705665 is about 27851.4930479499. The cubic root of 775705665 is about 918.8239797895.

The spelling of 775705665 in words is "seven hundred seventy-five million, seven hundred five thousand, six hundred sixty-five".