155630261162261 has 2 divisors, whose sum is σ = 155630261162262. Its totient is φ = 155630261162260.

The previous prime is 155630261162219. The next prime is 155630261162333. The reversal of 155630261162261 is 162261162036551.

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., 154610100561361 + 1020160600900 = 12434231^2 + 1010030^2 .

It is a cyclic number.

It is not a de Polignac number, because 155630261162261 - 2¹⁰ = 155630261161237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155630261161261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77815130581130 + 77815130581131.

It is an arithmetic number, because the mean of its divisors is an integer number (77815130581131).

Almost surely, 2^{155630261162261} is an apocalyptic number.

It is an amenable number.

155630261162261 is a deficient number, since it is larger than the sum of its proper divisors (1).

155630261162261 is an equidigital number, since it uses as much as digits as its factorization.

155630261162261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 155630261162261 in words is "one hundred fifty-five trillion, six hundred thirty billion, two hundred sixty-one million, one hundred sixty-two thousand, two hundred sixty-one".