161648805 has 8 divisors (see below), whose sum is σ = 258638112. Its totient is φ = 86212688.

The previous prime is 161648803. The next prime is 161648821. The reversal of 161648805 is 508846161.

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

It is a cyclic number.

It is not a de Polignac number, because 161648805 - 2¹ = 161648803 is a prime.

It is a super-2 number, since 2×161648805² = 52260672315856050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161648803) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5388279 + ... + 5388308.

It is an arithmetic number, because the mean of its divisors is an integer number (32329764).

Almost surely, 2^161648805 is an apocalyptic number.

161648805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161648805 is a deficient number, since it is larger than the sum of its proper divisors (96989307).

161648805 is a wasteful number, since it uses less digits than its factorization.

161648805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10776595.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 161648805 is about 12714.1183335692. The cubic root of 161648805 is about 544.7419646553.

The spelling of 161648805 in words is "one hundred sixty-one million, six hundred forty-eight thousand, eight hundred five".