155155563 has 6 divisors (see below), whose sum is σ = 224113604. Its totient is φ = 103437036.

The previous prime is 155155547. The next prime is 155155573. The reversal of 155155563 is 365551551.

155155563 is a `hidden beast` number, since 1 + 551 + 55 + 56 + 3 = 666.

It is not a de Polignac number, because 155155563 - 2⁴ = 155155547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155155573) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8619745 + ... + 8619762.

Almost surely, 2^155155563 is an apocalyptic number.

155155563 is a deficient number, since it is larger than the sum of its proper divisors (68958041).

155155563 is a wasteful number, since it uses less digits than its factorization.

155155563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17239513 (or 17239510 counting only the distinct ones).

The product of its digits is 56250, while the sum is 36.

The square root of 155155563 is about 12456.1455916347. The cubic root of 155155563 is about 537.3481819650.

The spelling of 155155563 in words is "one hundred fifty-five million, one hundred fifty-five thousand, five hundred sixty-three".