155995563 has 6 divisors (see below), whose sum is σ = 208022932. Its totient is φ = 103982620.

The previous prime is 155995561. The next prime is 155995573. The reversal of 155995563 is 365599551.

155995563 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 155995563 - 2¹ = 155995561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155995561) 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, 18028 + ... + 25238.

Almost surely, 2^155995563 is an apocalyptic number.

155995563 is a deficient number, since it is larger than the sum of its proper divisors (52027369).

155995563 is an frugal number, since it uses more digits than its factorization.

155995563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14425 (or 7214 counting only the distinct ones).

The product of its digits is 911250, while the sum is 48.

The square root of 155995563 is about 12489.8183733792. The cubic root of 155995563 is about 538.3161574607.

Multiplying 155995563 by its sum of digits (48), we get a square (7487787024 = 86532²).

The spelling of 155995563 in words is "one hundred fifty-five million, nine hundred ninety-five thousand, five hundred sixty-three".