155638161 has 36 divisors (see below), whose sum is σ = 263499600. Its totient is φ = 88261488.

The previous prime is 155638159. The next prime is 155638163. The reversal of 155638161 is 161836551.

155638161 is a `hidden beast` number, since 1 + 5 + 5 + 638 + 16 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (155638159) and next prime (155638163).

It is not a de Polignac number, because 155638161 - 2¹ = 155638159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155638163) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 60030 + ... + 62568.

Almost surely, 2^155638161 is an apocalyptic number.

It is an amenable number.

155638161 is a deficient number, since it is larger than the sum of its proper divisors (107861439).

155638161 is a wasteful number, since it uses less digits than its factorization.

155638161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698 (or 2688 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 155638161 is about 12475.5024347719. The cubic root of 155638161 is about 537.9047303931.

The spelling of 155638161 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, one hundred sixty-one".