1165685257 has 12 divisors (see below), whose sum is σ = 1350863856. Its totient is φ = 997375040.

The previous prime is 1165685251. The next prime is 1165685267. The reversal of 1165685257 is 7525865611.

It is not a de Polignac number, because 1165685257 - 2³ = 1165685249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165685251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180163 + ... + 186520.

It is an arithmetic number, because the mean of its divisors is an integer number (112571988).

Almost surely, 2^1165685257 is an apocalyptic number.

1165685257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1165685257 is a deficient number, since it is larger than the sum of its proper divisors (185178599).

1165685257 is a wasteful number, since it uses less digits than its factorization.

1165685257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366728 (or 366711 counting only the distinct ones).

The product of its digits is 504000, while the sum is 46.

The square root of 1165685257 is about 34142.1331641712. The cubic root of 1165685257 is about 1052.4313293533.

The spelling of 1165685257 in words is "one billion, one hundred sixty-five million, six hundred eighty-five thousand, two hundred fifty-seven".