161109770 has 16 divisors (see below), whose sum is σ = 290728008. Its totient is φ = 64281600.

The previous prime is 161109763. The next prime is 161109791. The reversal of 161109770 is 77901161.

It can be written as a sum of positive squares in 4 ways, for example, as 157427209 + 3682561 = 12547^2 + 1919^2 .

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 7 ways as a sum of consecutive naturals, for example, 16079 + ... + 24098.

Almost surely, 2^161109770 is an apocalyptic number.

161109770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161109770 is a deficient number, since it is larger than the sum of its proper divisors (129618238).

161109770 is a wasteful number, since it uses less digits than its factorization.

161109770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40585.

The product of its (nonzero) digits is 2646, while the sum is 32.

The square root of 161109770 is about 12692.9023473751. The cubic root of 161109770 is about 544.1357905143.

The spelling of 161109770 in words is "one hundred sixty-one million, one hundred nine thousand, seven hundred seventy".