1165641755 has 4 divisors (see below), whose sum is σ = 1398770112. Its totient is φ = 932513400.

The previous prime is 1165641713. The next prime is 1165641779. The reversal of 1165641755 is 5571465611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5571465611 = 631 ⋅8829581.

It is not a de Polignac number, because 1165641755 - 2¹⁰ = 1165640731 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116564171 + ... + 116564180.

It is an arithmetic number, because the mean of its divisors is an integer number (349692528).

Almost surely, 2^1165641755 is an apocalyptic number.

1165641755 is a deficient number, since it is larger than the sum of its proper divisors (233128357).

1165641755 is an equidigital number, since it uses as much as digits as its factorization.

1165641755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233128356.

The product of its digits is 126000, while the sum is 41.

The square root of 1165641755 is about 34141.4960861413. The cubic root of 1165641755 is about 1052.4182373581.

The spelling of 1165641755 in words is "one billion, one hundred sixty-five million, six hundred forty-one thousand, seven hundred fifty-five".