161770 has 16 divisors (see below), whose sum is σ = 332928. Its totient is φ = 55440.

The previous prime is 161761. The next prime is 161771. The reversal of 161770 is 77161.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161770.

It is not an unprimeable number, because it can be changed into a prime (161771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1086 + ... + 1225.

It is an arithmetic number, because the mean of its divisors is an integer number (20808).

2¹⁶¹⁷⁷⁰ is an apocalyptic number.

161770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161770 is an abundant number, since it is smaller than the sum of its proper divisors (171158).

It is a weird number, because it is abundant, but not a pseudoperfect number.

161770 is a wasteful number, since it uses less digits than its factorization.

161770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 161770 is about 402.2064146679. The cubic root of 161770 is about 54.4878069404.

The spelling of 161770 in words is "one hundred sixty-one thousand, seven hundred seventy".