168699661 has 8 divisors (see below), whose sum is σ = 182044800. Its totient is φ = 155407152.

The previous prime is 168699637. The next prime is 168699667. The reversal of 168699661 is 166996861.

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 168699661 - 2⁷ = 168699533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168699599 and 168699608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168699667) 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, 6361 + ... + 19438.

It is an arithmetic number, because the mean of its divisors is an integer number (22755600).

Almost surely, 2^168699661 is an apocalyptic number.

It is an amenable number.

168699661 is a deficient number, since it is larger than the sum of its proper divisors (13345139).

168699661 is a wasteful number, since it uses less digits than its factorization.

168699661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26315.

The product of its digits is 839808, while the sum is 52.

The square root of 168699661 is about 12988.4433632364. The cubic root of 168699661 is about 552.5497710464.

The spelling of 168699661 in words is "one hundred sixty-eight million, six hundred ninety-nine thousand, six hundred sixty-one".