155805057 has 6 divisors (see below), whose sum is σ = 225051762. Its totient is φ = 103870032.

The previous prime is 155805049. The next prime is 155805071. The reversal of 155805057 is 750508551.

155805057 is a `hidden beast` number, since 1 + 558 + 0 + 50 + 57 = 666.

It can be written as a sum of positive squares in only one way, i.e., 102090816 + 53714241 = 10104^2 + 7329^2 .

It is not a de Polignac number, because 155805057 - 2³ = 155805049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155805077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8655828 + ... + 8655845.

It is an arithmetic number, because the mean of its divisors is an integer number (37508627).

Almost surely, 2^155805057 is an apocalyptic number.

It is an amenable number.

155805057 is a deficient number, since it is larger than the sum of its proper divisors (69246705).

155805057 is a wasteful number, since it uses less digits than its factorization.

155805057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17311679 (or 17311676 counting only the distinct ones).

The product of its (nonzero) digits is 35000, while the sum is 36.

The square root of 155805057 is about 12482.1895915741. The cubic root of 155805057 is about 538.0969327792.

The spelling of 155805057 in words is "one hundred fifty-five million, eight hundred five thousand, fifty-seven".