168651641 has 8 divisors (see below), whose sum is σ = 171697344. Its totient is φ = 165615120.

The previous prime is 168651631. The next prime is 168651647. The reversal of 168651641 is 146156861.

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 168651641 - 2¹⁸ = 168389497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 168651595 and 168651604.

It is not an unprimeable number, because it can be changed into a prime (168651647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42446 + ... + 46248.

It is an arithmetic number, because the mean of its divisors is an integer number (21462168).

Almost surely, 2^168651641 is an apocalyptic number.

It is an amenable number.

168651641 is a deficient number, since it is larger than the sum of its proper divisors (3045703).

168651641 is an equidigital number, since it uses as much as digits as its factorization.

168651641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4591.

The product of its digits is 34560, while the sum is 38.

The square root of 168651641 is about 12986.5946652693. The cubic root of 168651641 is about 552.4973386985.

The spelling of 168651641 in words is "one hundred sixty-eight million, six hundred fifty-one thousand, six hundred forty-one".