155804880989 has 8 divisors (see below), whose sum is σ = 157332459480. Its totient is φ = 154284077376.

The previous prime is 155804880971. The next prime is 155804880991. The reversal of 155804880989 is 989088408551.

It can be written as a sum of positive squares in 4 ways, for example, as 75877109764 + 79927771225 = 275458^2 + 282715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155804880989 - 2²⁰ = 155803832413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155804888989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1647494 + ... + 1739495.

It is an arithmetic number, because the mean of its divisors is an integer number (19666557435).

Almost surely, 2^155804880989 is an apocalyptic number.

It is an amenable number.

155804880989 is a deficient number, since it is larger than the sum of its proper divisors (1527578491).

155804880989 is a wasteful number, since it uses less digits than its factorization.

155804880989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387439.

The product of its (nonzero) digits is 33177600, while the sum is 65.

The spelling of 155804880989 in words is "one hundred fifty-five billion, eight hundred four million, eight hundred eighty thousand, nine hundred eighty-nine".