161863875 has 24 divisors (see below), whose sum is σ = 291788640. Its totient is φ = 86326800.

The previous prime is 161863837. The next prime is 161863879. The reversal of 161863875 is 578368161.

161863875 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 638 + 7 + 5 = 666.

161863875 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 161863875 - 2⁸ = 161863619 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 161863875.

It is not an unprimeable number, because it can be changed into a prime (161863879) 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, 70815 + ... + 73064.

It is an arithmetic number, because the mean of its divisors is an integer number (12157860).

Almost surely, 2^161863875 is an apocalyptic number.

161863875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161863875 is a deficient number, since it is larger than the sum of its proper divisors (129924765).

161863875 is a wasteful number, since it uses less digits than its factorization.

161863875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143900 (or 143887 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 161863875 is about 12722.5734425076. The cubic root of 161863875 is about 544.9834464573.

The spelling of 161863875 in words is "one hundred sixty-one million, eight hundred sixty-three thousand, eight hundred seventy-five".