155206783181 has 2 divisors, whose sum is σ = 155206783182. Its totient is φ = 155206783180.

The previous prime is 155206783157. The next prime is 155206783211. The reversal of 155206783181 is 181387602551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152951388100 + 2255395081 = 391090^2 + 47491^2 .

It is a cyclic number.

It is not a de Polignac number, because 155206783181 - 2²⁶ = 155139674317 is a prime.

It is a super-2 number, since 2×155206783181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155206783111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77603391590 + 77603391591.

It is an arithmetic number, because the mean of its divisors is an integer number (77603391591).

Almost surely, 2^155206783181 is an apocalyptic number.

It is an amenable number.

155206783181 is a deficient number, since it is larger than the sum of its proper divisors (1).

155206783181 is an equidigital number, since it uses as much as digits as its factorization.

155206783181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 155206783181 in words is "one hundred fifty-five billion, two hundred six million, seven hundred eighty-three thousand, one hundred eighty-one".