2261178165 has 16 divisors (see below), whose sum is σ = 3618476928. Its totient is φ = 1205764416.

The previous prime is 2261178133. The next prime is 2261178193. The reversal of 2261178165 is 5618711622.

It is not a de Polignac number, because 2261178165 - 2⁵ = 2261178133 is a prime.

It is a super-2 number, since 2×2261178165² = 10225853387745534450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161224 + ... + 174686.

It is an arithmetic number, because the mean of its divisors is an integer number (226154808).

Almost surely, 2^2261178165 is an apocalyptic number.

It is an amenable number.

2261178165 is a deficient number, since it is larger than the sum of its proper divisors (1357298763).

2261178165 is a wasteful number, since it uses less digits than its factorization.

2261178165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24668.

The product of its digits is 40320, while the sum is 39.

The square root of 2261178165 is about 47551.8471250066. The cubic root of 2261178165 is about 1312.5371193130.

Adding to 2261178165 its reverse (5618711622), we get a palindrome (7879889787).

The spelling of 2261178165 in words is "two billion, two hundred sixty-one million, one hundred seventy-eight thousand, one hundred sixty-five".