2661078869 has 2 divisors, whose sum is σ = 2661078870. Its totient is φ = 2661078868.

The previous prime is 2661078857. The next prime is 2661078899. The reversal of 2661078869 is 9688701662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2424380644 + 236698225 = 49238^2 + 15385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661078869 is a prime.

It is a super-2 number, since 2×2661078869² = 14162681494076638322, 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 2661078869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661078899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330539434 + 1330539435.

It is an arithmetic number, because the mean of its divisors is an integer number (1330539435).

Almost surely, 2^2661078869 is an apocalyptic number.

It is an amenable number.

2661078869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661078869 is an equidigital number, since it uses as much as digits as its factorization.

2661078869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 2661078869 is about 51585.6459589293. The cubic root of 2661078869 is about 1385.7532807488.

The spelling of 2661078869 in words is "two billion, six hundred sixty-one million, seventy-eight thousand, eight hundred sixty-nine".