161506610 has 8 divisors (see below), whose sum is σ = 290711916. Its totient is φ = 64602640.

The previous prime is 161506607. The next prime is 161506627. The reversal of 161506610 is 16605161.

It can be written as a sum of positive squares in 2 ways, for example, as 159946609 + 1560001 = 12647^2 + 1249^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161506610.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8075321 + ... + 8075340.

Almost surely, 2^161506610 is an apocalyptic number.

161506610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161506610 is a deficient number, since it is larger than the sum of its proper divisors (129205306).

161506610 is a wasteful number, since it uses less digits than its factorization.

161506610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16150668.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 161506610 is about 12708.5250914494. The cubic root of 161506610 is about 544.5821896680.

The spelling of 161506610 in words is "one hundred sixty-one million, five hundred six thousand, six hundred ten".