2661316639 has 2 divisors, whose sum is σ = 2661316640. Its totient is φ = 2661316638.

The previous prime is 2661316633. The next prime is 2661316661. The reversal of 2661316639 is 9366131662.

2661316639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2661316639 - 2¹⁷ = 2661185567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2661316595 and 2661316604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661316633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330658319 + 1330658320.

It is an arithmetic number, because the mean of its divisors is an integer number (1330658320).

Almost surely, 2^2661316639 is an apocalyptic number.

2661316639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661316639 is an equidigital number, since it uses as much as digits as its factorization.

2661316639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 43.

The square root of 2661316639 is about 51587.9505214154. The cubic root of 2661316639 is about 1385.7945523233.

The spelling of 2661316639 in words is "two billion, six hundred sixty-one million, three hundred sixteen thousand, six hundred thirty-nine".