161078458 has 4 divisors (see below), whose sum is σ = 241617690. Its totient is φ = 80539228.

The previous prime is 161078443. The next prime is 161078479. The reversal of 161078458 is 854870161.

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

It can be written as a sum of positive squares in only one way, i.e., 129572689 + 31505769 = 11383^2 + 5613^2 .

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 161078458.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40269613 + ... + 40269616.

Almost surely, 2^161078458 is an apocalyptic number.

161078458 is a deficient number, since it is larger than the sum of its proper divisors (80539232).

161078458 is an equidigital number, since it uses as much as digits as its factorization.

161078458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80539231.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 161078458 is about 12691.6688421972. The cubic root of 161078458 is about 544.1005369441.

The spelling of 161078458 in words is "one hundred sixty-one million, seventy-eight thousand, four hundred fifty-eight".