161486778 has 8 divisors (see below), whose sum is σ = 322973568. Its totient is φ = 53828924.

The previous prime is 161486777. The next prime is 161486807. The reversal of 161486778 is 877684161.

161486778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

161486778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (161486771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13457226 + ... + 13457237.

It is an arithmetic number, because the mean of its divisors is an integer number (40371696).

Almost surely, 2^161486778 is an apocalyptic number.

161486778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161486778 is a wasteful number, since it uses less digits than its factorization.

161486778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26914468.

The product of its digits is 451584, while the sum is 48.

The square root of 161486778 is about 12707.7448038588. The cubic root of 161486778 is about 544.5598983284.

The spelling of 161486778 in words is "one hundred sixty-one million, four hundred eighty-six thousand, seven hundred seventy-eight".