2638670869 has 2 divisors, whose sum is σ = 2638670870. Its totient is φ = 2638670868.

The previous prime is 2638670819. The next prime is 2638670893. The reversal of 2638670869 is 9680768362.

It is a happy number.

2638670869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1921770244 + 716900625 = 43838^2 + 26775^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638670869 - 2²¹ = 2636573717 is a prime.

It is a super-2 number, since 2×2638670869² = 13925167909818430322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2638670819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319335434 + 1319335435.

It is an arithmetic number, because the mean of its divisors is an integer number (1319335435).

Almost surely, 2^2638670869 is an apocalyptic number.

It is an amenable number.

2638670869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638670869 is an equidigital number, since it uses as much as digits as its factorization.

2638670869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The square root of 2638670869 is about 51367.9945978038. The cubic root of 2638670869 is about 1381.8526662152.

The spelling of 2638670869 in words is "two billion, six hundred thirty-eight million, six hundred seventy thousand, eight hundred sixty-nine".