261163516093 has 2 divisors, whose sum is σ = 261163516094. Its totient is φ = 261163516092.

The previous prime is 261163516067. The next prime is 261163516127. The reversal of 261163516093 is 390615361162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213686156644 + 47477359449 = 462262^2 + 217893^2 .

It is a cyclic number.

It is not a de Polignac number, because 261163516093 - 2²⁵ = 261129961661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261163916093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130581758046 + 130581758047.

It is an arithmetic number, because the mean of its divisors is an integer number (130581758047).

Almost surely, 2^261163516093 is an apocalyptic number.

It is an amenable number.

261163516093 is a deficient number, since it is larger than the sum of its proper divisors (1).

261163516093 is an equidigital number, since it uses as much as digits as its factorization.

261163516093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 261163516093 in words is "two hundred sixty-one billion, one hundred sixty-three million, five hundred sixteen thousand, ninety-three".