26485477561 has 2 divisors, whose sum is σ = 26485477562. Its totient is φ = 26485477560.

The previous prime is 26485477559. The next prime is 26485477583. The reversal of 26485477561 is 16577458462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19045380025 + 7440097536 = 138005^2 + 86256^2 .

It is a cyclic number.

It is not a de Polignac number, because 26485477561 - 2¹ = 26485477559 is a prime.

Together with 26485477559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26485477531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13242738780 + 13242738781.

It is an arithmetic number, because the mean of its divisors is an integer number (13242738781).

Almost surely, 2^26485477561 is an apocalyptic number.

It is an amenable number.

26485477561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26485477561 is an equidigital number, since it uses as much as digits as its factorization.

26485477561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11289600, while the sum is 55.

The spelling of 26485477561 in words is "twenty-six billion, four hundred eighty-five million, four hundred seventy-seven thousand, five hundred sixty-one".