161537770 has 8 divisors (see below), whose sum is σ = 290768004. Its totient is φ = 64615104.

The previous prime is 161537741. The next prime is 161537773. The reversal of 161537770 is 77735161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 154231561 + 7306209 = 12419^2 + 2703^2 .

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

It is a super-2 number, since 2×161537770² = 52188902273145800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161537773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8076879 + ... + 8076898.

Almost surely, 2^161537770 is an apocalyptic number.

161537770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161537770 is a deficient number, since it is larger than the sum of its proper divisors (129230234).

161537770 is a wasteful number, since it uses less digits than its factorization.

161537770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16153784.

The product of its (nonzero) digits is 30870, while the sum is 37.

The square root of 161537770 is about 12709.7509810381. The cubic root of 161537770 is about 544.6172100919.

The spelling of 161537770 in words is "one hundred sixty-one million, five hundred thirty-seven thousand, seven hundred seventy".