155011100326261 has 2 divisors, whose sum is σ = 155011100326262. Its totient is φ = 155011100326260.

The previous prime is 155011100326237. The next prime is 155011100326339. The reversal of 155011100326261 is 162623001110551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113512638201361 + 41498462124900 = 10654231^2 + 6441930^2 .

It is an emirp because it is prime and its reverse (162623001110551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155011100326261 - 2⁷ = 155011100326133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155011100326231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77505550163130 + 77505550163131.

It is an arithmetic number, because the mean of its divisors is an integer number (77505550163131).

Almost surely, 2^{155011100326261} is an apocalyptic number.

It is an amenable number.

155011100326261 is a deficient number, since it is larger than the sum of its proper divisors (1).

155011100326261 is an equidigital number, since it uses as much as digits as its factorization.

155011100326261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 155011100326261 in words is "one hundred fifty-five trillion, eleven billion, one hundred million, three hundred twenty-six thousand, two hundred sixty-one".