1772665565 has 32 divisors (see below), whose sum is σ = 2493846144. Its totient is φ = 1195223040.

The previous prime is 1772665549. The next prime is 1772665567. The reversal of 1772665565 is 5655662771.

It is not a de Polignac number, because 1772665565 - 2⁴ = 1772665549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1772665567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48497 + ... + 76793.

It is an arithmetic number, because the mean of its divisors is an integer number (77932692).

Almost surely, 2^1772665565 is an apocalyptic number.

It is an amenable number.

1772665565 is a deficient number, since it is larger than the sum of its proper divisors (721180579).

1772665565 is a wasteful number, since it uses less digits than its factorization.

1772665565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28397.

The product of its digits is 2646000, while the sum is 50.

The square root of 1772665565 is about 42103.0351043722. The cubic root of 1772665565 is about 1210.2514253386.

The spelling of 1772665565 in words is "one billion, seven hundred seventy-two million, six hundred sixty-five thousand, five hundred sixty-five".