161481478 has 4 divisors (see below), whose sum is σ = 242222220. Its totient is φ = 80740738.

The previous prime is 161481461. The next prime is 161481517. The reversal of 161481478 is 874184161.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 161481478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40370368 + ... + 40370371.

It is an arithmetic number, because the mean of its divisors is an integer number (60555555).

Almost surely, 2^161481478 is an apocalyptic number.

161481478 is a deficient number, since it is larger than the sum of its proper divisors (80740742).

161481478 is an equidigital number, since it uses as much as digits as its factorization.

161481478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80740741.

The product of its digits is 43008, while the sum is 40.

The square root of 161481478 is about 12707.5362679002. The cubic root of 161481478 is about 544.5539407735.

The spelling of 161481478 in words is "one hundred sixty-one million, four hundred eighty-one thousand, four hundred seventy-eight".