161878455 has 24 divisors (see below), whose sum is σ = 287436240. Its totient is φ = 84228480.

The previous prime is 161878447. The next prime is 161878459. The reversal of 161878455 is 554878161.

161878455 is a `hidden beast` number, since 16 + 187 + 8 + 455 = 666.

161878455 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 161878455 - 2³ = 161878447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161878455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161878459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42025 + ... + 45714.

It is an arithmetic number, because the mean of its divisors is an integer number (11976510).

Almost surely, 2^161878455 is an apocalyptic number.

161878455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161878455 is a deficient number, since it is larger than the sum of its proper divisors (125557785).

161878455 is a wasteful number, since it uses less digits than its factorization.

161878455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87791 (or 87788 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 161878455 is about 12723.1464268867. The cubic root of 161878455 is about 544.9998092191. Note that the first 3 decimals are identical.

It can be divided in two parts, 16187 and 8455, that added together give a palindrome (24642).

The spelling of 161878455 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, four hundred fifty-five".