261050552137 has 2 divisors, whose sum is σ = 261050552138. Its totient is φ = 261050552136.

The previous prime is 261050552129. The next prime is 261050552141. The reversal of 261050552137 is 731255050162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160888429881 + 100162122256 = 401109^2 + 316484^2 .

It is a cyclic number.

It is not a de Polignac number, because 261050552137 - 2³ = 261050552129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261050552096 and 261050552105.

It is not a weakly prime, because it can be changed into another prime (261050552177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130525276068 + 130525276069.

It is an arithmetic number, because the mean of its divisors is an integer number (130525276069).

Almost surely, 2^261050552137 is an apocalyptic number.

It is an amenable number.

261050552137 is a deficient number, since it is larger than the sum of its proper divisors (1).

261050552137 is an equidigital number, since it uses as much as digits as its factorization.

261050552137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 37.

The spelling of 261050552137 in words is "two hundred sixty-one billion, fifty million, five hundred fifty-two thousand, one hundred thirty-seven".