155821808468 has 12 divisors (see below), whose sum is σ = 272692612500. Its totient is φ = 77909633472.

The previous prime is 155821808453. The next prime is 155821808491. The reversal of 155821808468 is 864808128551.

It can be written as a sum of positive squares in 2 ways, for example, as 29447246404 + 126374562064 = 171602^2 + 355492^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8321 + ... + 558312.

It is an arithmetic number, because the mean of its divisors is an integer number (22724384375).

Almost surely, 2^155821808468 is an apocalyptic number.

It is an amenable number.

155821808468 is a deficient number, since it is larger than the sum of its proper divisors (116870804032).

155821808468 is a wasteful number, since it uses less digits than its factorization.

155821808468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635386 (or 635384 counting only the distinct ones).

The product of its (nonzero) digits is 4915200, while the sum is 56.

The spelling of 155821808468 in words is "one hundred fifty-five billion, eight hundred twenty-one million, eight hundred eight thousand, four hundred sixty-eight".