10549138661 has 2 divisors, whose sum is σ = 10549138662. Its totient is φ = 10549138660.

The previous prime is 10549138657. The next prime is 10549138693. The reversal of 10549138661 is 16683194501.

10549138661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10548522436 + 616225 = 102706^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 10549138661 - 2² = 10549138657 is a prime.

It is a super-2 number, since 2×10549138661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10549138601) 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, 5274569330 + 5274569331.

It is an arithmetic number, because the mean of its divisors is an integer number (5274569331).

Almost surely, 2^10549138661 is an apocalyptic number.

It is an amenable number.

10549138661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10549138661 is an equidigital number, since it uses as much as digits as its factorization.

10549138661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 10549138661 in words is "ten billion, five hundred forty-nine million, one hundred thirty-eight thousand, six hundred sixty-one".