161335978 has 8 divisors (see below), whose sum is σ = 242904420. Its totient is φ = 80367840.

The previous prime is 161335949. The next prime is 161335987. The reversal of 161335978 is 879533161.

It can be written as a sum of positive squares in 2 ways, for example, as 161112249 + 223729 = 12693^2 + 473^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149403 + ... + 150478.

Almost surely, 2^161335978 is an apocalyptic number.

161335978 is a deficient number, since it is larger than the sum of its proper divisors (81568442).

161335978 is a wasteful number, since it uses less digits than its factorization.

161335978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300152.

The product of its digits is 136080, while the sum is 43.

The square root of 161335978 is about 12701.8100284959. The cubic root of 161335978 is about 544.3903380942.

The spelling of 161335978 in words is "one hundred sixty-one million, three hundred thirty-five thousand, nine hundred seventy-eight".