155878389209 has 2 divisors, whose sum is σ = 155878389210. Its totient is φ = 155878389208.

The previous prime is 155878389203. The next prime is 155878389281. The reversal of 155878389209 is 902983878551.

155878389209 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., 108275876809 + 47602512400 = 329053^2 + 218180^2 .

It is a cyclic number.

It is not a de Polignac number, because 155878389209 - 2³⁶ = 87158912473 is a prime.

It is not a weakly prime, because it can be changed into another prime (155878389203) 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, 77939194604 + 77939194605.

It is an arithmetic number, because the mean of its divisors is an integer number (77939194605).

Almost surely, 2^155878389209 is an apocalyptic number.

It is an amenable number.

155878389209 is a deficient number, since it is larger than the sum of its proper divisors (1).

155878389209 is an equidigital number, since it uses as much as digits as its factorization.

155878389209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43545600, while the sum is 65.

The spelling of 155878389209 in words is "one hundred fifty-five billion, eight hundred seventy-eight million, three hundred eighty-nine thousand, two hundred nine".