2165126278 has 32 divisors (see below), whose sum is σ = 3810240000. Its totient is φ = 903359040.

The previous prime is 2165126261. The next prime is 2165126311. The reversal of 2165126278 is 8726215612.

It is a super-2 number, since 2×2165126278² = 9375543599372266568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2165126278.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284973 + ... + 292471.

It is an arithmetic number, because the mean of its divisors is an integer number (119070000).

Almost surely, 2^2165126278 is an apocalyptic number.

2165126278 is a deficient number, since it is larger than the sum of its proper divisors (1645113722).

2165126278 is a wasteful number, since it uses less digits than its factorization.

2165126278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8052.

The product of its digits is 80640, while the sum is 40.

The square root of 2165126278 is about 46530.9174420621. The cubic root of 2165126278 is about 1293.6826200978.

The spelling of 2165126278 in words is "two billion, one hundred sixty-five million, one hundred twenty-six thousand, two hundred seventy-eight".