161774978 has 8 divisors (see below), whose sum is σ = 243187968. Its totient is φ = 80712324.

The previous prime is 161774959. The next prime is 161774983. The reversal of 161774978 is 879477161.

161774978 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.

It is a super-2 number, since 2×161774978² = 52342287013800968, which contains 22 as substring.

It is an unprimeable number.

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, 86426 + ... + 88277.

It is an arithmetic number, because the mean of its divisors is an integer number (30398496).

Almost surely, 2^161774978 is an apocalyptic number.

161774978 is a deficient number, since it is larger than the sum of its proper divisors (81412990).

161774978 is a wasteful number, since it uses less digits than its factorization.

161774978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175168.

The product of its digits is 592704, while the sum is 50.

The square root of 161774978 is about 12719.0792905776. The cubic root of 161774978 is about 544.8836583579.

The spelling of 161774978 in words is "one hundred sixty-one million, seven hundred seventy-four thousand, nine hundred seventy-eight".