161920668 has 48 divisors (see below), whose sum is σ = 465006080. Its totient is φ = 42704064.

The previous prime is 161920651. The next prime is 161920669. The reversal of 161920668 is 866029161.

161920668 is nontrivially palindromic in base 11.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161920669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73048 + ... + 75231.

Almost surely, 2^161920668 is an apocalyptic number.

It is an amenable number.

161920668 is an abundant number, since it is smaller than the sum of its proper divisors (303085412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161920668 is a wasteful number, since it uses less digits than its factorization.

161920668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148306 (or 148304 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 161920668 is about 12724.8052244425. The cubic root of 161920668 is about 545.0471782518.

The spelling of 161920668 in words is "one hundred sixty-one million, nine hundred twenty thousand, six hundred sixty-eight".