155558874778 has 8 divisors (see below), whose sum is σ = 233368548768. Its totient is φ = 77769358524.

The previous prime is 155558874769. The next prime is 155558874853. The reversal of 155558874778 is 877478855551.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5020126 + ... + 5051017.

It is an arithmetic number, because the mean of its divisors is an integer number (29171068596).

Almost surely, 2^155558874778 is an apocalyptic number.

155558874778 is a deficient number, since it is larger than the sum of its proper divisors (77809673990).

155558874778 is a wasteful number, since it uses less digits than its factorization.

155558874778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10078868.

The product of its digits is 439040000, while the sum is 70.

The spelling of 155558874778 in words is "one hundred fifty-five billion, five hundred fifty-eight million, eight hundred seventy-four thousand, seven hundred seventy-eight".