161668340 has 24 divisors (see below), whose sum is σ = 357372960. Its totient is φ = 61263648.

The previous prime is 161668291. The next prime is 161668369. The reversal of 161668340 is 43866161.

It is a super-2 number, since 2×161668340² = 52273304316711200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161668340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212342 + ... + 213101.

It is an arithmetic number, because the mean of its divisors is an integer number (14890540).

Almost surely, 2^161668340 is an apocalyptic number.

161668340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161668340 is an abundant number, since it is smaller than the sum of its proper divisors (195704620).

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

161668340 is a wasteful number, since it uses less digits than its factorization.

161668340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425471 (or 425469 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 161668340 is about 12714.8865508112. The cubic root of 161668340 is about 544.7639075036.

The spelling of 161668340 in words is "one hundred sixty-one million, six hundred sixty-eight thousand, three hundred forty".