161738705 has 4 divisors (see below), whose sum is σ = 194086452. Its totient is φ = 129390960.

The previous prime is 161738693. The next prime is 161738711. The reversal of 161738705 is 507837161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62457409 + 99281296 = 7903^2 + 9964^2 .

It is not a de Polignac number, because 161738705 - 2⁸ = 161738449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16173866 + ... + 16173875.

It is an arithmetic number, because the mean of its divisors is an integer number (48521613).

Almost surely, 2^161738705 is an apocalyptic number.

It is an amenable number.

161738705 is a deficient number, since it is larger than the sum of its proper divisors (32347747).

161738705 is an equidigital number, since it uses as much as digits as its factorization.

161738705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32347746.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 161738705 is about 12717.6532819542. The cubic root of 161738705 is about 544.8429309175.

The spelling of 161738705 in words is "one hundred sixty-one million, seven hundred thirty-eight thousand, seven hundred five".