26973653621 has 2 divisors, whose sum is σ = 26973653622. Its totient is φ = 26973653620.

The previous prime is 26973653617. The next prime is 26973653747. The reversal of 26973653621 is 12635637962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24060352996 + 2913300625 = 155114^2 + 53975^2 .

It is a cyclic number.

It is not a de Polignac number, because 26973653621 - 2² = 26973653617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 26973653621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26973653321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13486826810 + 13486826811.

It is an arithmetic number, because the mean of its divisors is an integer number (13486826811).

Almost surely, 2^26973653621 is an apocalyptic number.

It is an amenable number.

26973653621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26973653621 is an equidigital number, since it uses as much as digits as its factorization.

26973653621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 50.

The spelling of 26973653621 in words is "twenty-six billion, nine hundred seventy-three million, six hundred fifty-three thousand, six hundred twenty-one".