155688256081 has 2 divisors, whose sum is σ = 155688256082. Its totient is φ = 155688256080.

The previous prime is 155688256057. The next prime is 155688256103. The reversal of 155688256081 is 180652886551.

155688256081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140115462400 + 15572793681 = 374320^2 + 124791^2 .

It is an emirp because it is prime and its reverse (180652886551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155688256081 - 2⁵ = 155688256049 is a prime.

It is a super-2 number, since 2×155688256081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155688256021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77844128040 + 77844128041.

It is an arithmetic number, because the mean of its divisors is an integer number (77844128041).

Almost surely, 2^155688256081 is an apocalyptic number.

It is an amenable number.

155688256081 is a deficient number, since it is larger than the sum of its proper divisors (1).

155688256081 is an equidigital number, since it uses as much as digits as its factorization.

155688256081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608000, while the sum is 55.

The spelling of 155688256081 in words is "one hundred fifty-five billion, six hundred eighty-eight million, two hundred fifty-six thousand, eighty-one".