155512032209 has 2 divisors, whose sum is σ = 155512032210. Its totient is φ = 155512032208.

The previous prime is 155512032199. The next prime is 155512032233. The reversal of 155512032209 is 902230215551.

155512032209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133149820609 + 22362211600 = 364897^2 + 149540^2 .

It is a cyclic number.

It is not a de Polignac number, because 155512032209 - 2³² = 151217064913 is a prime.

It is not a weakly prime, because it can be changed into another prime (155512932209) 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, 77756016104 + 77756016105.

It is an arithmetic number, because the mean of its divisors is an integer number (77756016105).

Almost surely, 2^155512032209 is an apocalyptic number.

It is an amenable number.

155512032209 is a deficient number, since it is larger than the sum of its proper divisors (1).

155512032209 is an equidigital number, since it uses as much as digits as its factorization.

155512032209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 155512032209 in words is "one hundred fifty-five billion, five hundred twelve million, thirty-two thousand, two hundred nine".