26637676649 has 2 divisors, whose sum is σ = 26637676650. Its totient is φ = 26637676648.

The previous prime is 26637676577. The next prime is 26637676661. The reversal of 26637676649 is 94667673662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24286105600 + 2351571049 = 155840^2 + 48493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26637676649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26637676591 and 26637676600.

It is not a weakly prime, because it can be changed into another prime (26637670649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13318838324 + 13318838325.

It is an arithmetic number, because the mean of its divisors is an integer number (13318838325).

Almost surely, 2^26637676649 is an apocalyptic number.

It is an amenable number.

26637676649 is a deficient number, since it is larger than the sum of its proper divisors (1).

26637676649 is an equidigital number, since it uses as much as digits as its factorization.

26637676649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82301184, while the sum is 62.

The spelling of 26637676649 in words is "twenty-six billion, six hundred thirty-seven million, six hundred seventy-six thousand, six hundred forty-nine".