2661551353193 has 2 divisors, whose sum is σ = 2661551353194. Its totient is φ = 2661551353192.

The previous prime is 2661551353187. The next prime is 2661551353199. The reversal of 2661551353193 is 3913531551662.

It is a happy number.

2661551353193 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (2661551353187) and next prime (2661551353199).

It can be written as a sum of positive squares in only one way, i.e., 2225968513024 + 435582840169 = 1491968^2 + 659987^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661551353193 - 2⁴ = 2661551353177 is a prime.

It is not a weakly prime, because it can be changed into another prime (2661551353199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330775676596 + 1330775676597.

It is an arithmetic number, because the mean of its divisors is an integer number (1330775676597).

Almost surely, 2^{2661551353193} is an apocalyptic number.

It is an amenable number.

2661551353193 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661551353193 is an equidigital number, since it uses as much as digits as its factorization.

2661551353193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2187000, while the sum is 50.

The spelling of 2661551353193 in words is "two trillion, six hundred sixty-one billion, five hundred fifty-one million, three hundred fifty-three thousand, one hundred ninety-three".