1165571155 has 16 divisors (see below), whose sum is σ = 1599264000. Its totient is φ = 798865632.

The previous prime is 1165571149. The next prime is 1165571167. The reversal of 1165571155 is 5511755611.

It is a cyclic number.

It is not a de Polignac number, because 1165571155 - 2⁵ = 1165571123 is a prime.

It is a super-2 number, since 2×1165571155² = 2717112234736068050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79596 + ... + 93094.

It is an arithmetic number, because the mean of its divisors is an integer number (99954000).

Almost surely, 2^1165571155 is an apocalyptic number.

1165571155 is a deficient number, since it is larger than the sum of its proper divisors (433692845).

1165571155 is a wasteful number, since it uses less digits than its factorization.

1165571155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15978.

The product of its digits is 26250, while the sum is 37.

The square root of 1165571155 is about 34140.4621380555. The cubic root of 1165571155 is about 1052.3969894840.

The spelling of 1165571155 in words is "one billion, one hundred sixty-five million, five hundred seventy-one thousand, one hundred fifty-five".