26435689661 has 2 divisors, whose sum is σ = 26435689662. Its totient is φ = 26435689660.

The previous prime is 26435689583. The next prime is 26435689727. The reversal of 26435689661 is 16698653462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13854702436 + 12580987225 = 117706^2 + 112165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26435689661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26435689597 and 26435689606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26435683661) 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, 13217844830 + 13217844831.

It is an arithmetic number, because the mean of its divisors is an integer number (13217844831).

Almost surely, 2^26435689661 is an apocalyptic number.

It is an amenable number.

26435689661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26435689661 is an equidigital number, since it uses as much as digits as its factorization.

26435689661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11197440, while the sum is 56.

The spelling of 26435689661 in words is "twenty-six billion, four hundred thirty-five million, six hundred eighty-nine thousand, six hundred sixty-one".