155778481806 has 96 divisors (see below), whose sum is σ = 331299487584. Its totient is φ = 48790656000.

The previous prime is 155778481777. The next prime is 155778481811. The reversal of 155778481806 is 608184877551.

It is a self number, because there is not a number n which added to its sum of digits gives 155778481806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37689316 + ... + 37693448.

It is an arithmetic number, because the mean of its divisors is an integer number (3451036329).

Almost surely, 2^155778481806 is an apocalyptic number.

155778481806 is an abundant number, since it is smaller than the sum of its proper divisors (175521005778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155778481806 is a wasteful number, since it uses less digits than its factorization.

155778481806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4358 (or 4317 counting only the distinct ones).

The product of its (nonzero) digits is 15052800, while the sum is 60.

The spelling of 155778481806 in words is "one hundred fifty-five billion, seven hundred seventy-eight million, four hundred eighty-one thousand, eight hundred six".