155772778775 has 12 divisors (see below), whose sum is σ = 194001738600. Its totient is φ = 124074034080.

The previous prime is 155772778703. The next prime is 155772778787. The reversal of 155772778775 is 577877277551.

155772778775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155772778775 - 2²⁴ = 155756001559 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 13598885 + ... + 13610334.

It is an arithmetic number, because the mean of its divisors is an integer number (16166811550).

Almost surely, 2^155772778775 is an apocalyptic number.

155772778775 is a deficient number, since it is larger than the sum of its proper divisors (38228959825).

155772778775 is a wasteful number, since it uses less digits than its factorization.

155772778775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27209458 (or 27209453 counting only the distinct ones).

The product of its digits is 235298000, while the sum is 68.

The spelling of 155772778775 in words is "one hundred fifty-five billion, seven hundred seventy-two million, seven hundred seventy-eight thousand, seven hundred seventy-five".