1258161165 has 12 divisors (see below), whose sum is σ = 2180812764. Its totient is φ = 671019264.

The previous prime is 1258161161. The next prime is 1258161169. The reversal of 1258161165 is 5611618521.

1258161165 is a `hidden beast` number, since 1 + 2 + 581 + 6 + 11 + 65 = 666.

It is an interprime number because it is at equal distance from previous prime (1258161161) and next prime (1258161169).

It can be written as a sum of positive squares in 2 ways, for example, as 676676169 + 581484996 = 26013^2 + 24114^2 .

It is not a de Polignac number, because 1258161165 - 2² = 1258161161 is a prime.

It is a super-2 number, since 2×1258161165² = 3165939034228314450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1258161161) 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, 13979524 + ... + 13979613.

It is an arithmetic number, because the mean of its divisors is an integer number (181734397).

Almost surely, 2^1258161165 is an apocalyptic number.

1258161165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1258161165 is a deficient number, since it is larger than the sum of its proper divisors (922651599).

1258161165 is a wasteful number, since it uses less digits than its factorization.

1258161165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27959148 (or 27959145 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 1258161165 is about 35470.5675877903. The cubic root of 1258161165 is about 1079.5566209853.

Adding to 1258161165 its reverse (5611618521), we get a palindrome (6869779686).

The spelling of 1258161165 in words is "one billion, two hundred fifty-eight million, one hundred sixty-one thousand, one hundred sixty-five".