161878623 has 16 divisors (see below), whose sum is σ = 225904896. Its totient is φ = 102914240.

The previous prime is 161878603. The next prime is 161878637. The reversal of 161878623 is 326878161.

161878623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161878623 is a prime.

It is a super-2 number, since 2×161878623² = 52409377168752258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161878603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20563 + ... + 27323.

It is an arithmetic number, because the mean of its divisors is an integer number (14119056).

Almost surely, 2^161878623 is an apocalyptic number.

161878623 is a deficient number, since it is larger than the sum of its proper divisors (64026273).

161878623 is a wasteful number, since it uses less digits than its factorization.

161878623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134.

The product of its digits is 96768, while the sum is 42.

The square root of 161878623 is about 12723.1530290255. The cubic root of 161878623 is about 544.9999977555. Note that the first 5 decimals are identical.

The spelling of 161878623 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, six hundred twenty-three".