17754256661 has 2 divisors, whose sum is σ = 17754256662. Its totient is φ = 17754256660.

The previous prime is 17754256613. The next prime is 17754256673. The reversal of 17754256661 is 16665245771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12870902500 + 4883354161 = 113450^2 + 69881^2 .

It is a cyclic number.

It is not a de Polignac number, because 17754256661 - 2¹⁴ = 17754240277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17754256361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8877128330 + 8877128331.

It is an arithmetic number, because the mean of its divisors is an integer number (8877128331).

Almost surely, 2^17754256661 is an apocalyptic number.

It is an amenable number.

17754256661 is a deficient number, since it is larger than the sum of its proper divisors (1).

17754256661 is an equidigital number, since it uses as much as digits as its factorization.

17754256661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 50.

The spelling of 17754256661 in words is "seventeen billion, seven hundred fifty-four million, two hundred fifty-six thousand, six hundred sixty-one".