168368220561 has 8 divisors (see below), whose sum is σ = 232232028480. Its totient is φ = 108374946512.

The previous prime is 168368220557. The next prime is 168368220563. The reversal of 168368220561 is 165022863861.

It is a happy number.

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 168368220561 - 2² = 168368220557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168368220561.

It is not an unprimeable number, because it can be changed into a prime (168368220563) 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, 967633365 + ... + 967633538.

It is an arithmetic number, because the mean of its divisors is an integer number (29029003560).

Almost surely, 2^168368220561 is an apocalyptic number.

It is an amenable number.

168368220561 is a deficient number, since it is larger than the sum of its proper divisors (63863807919).

168368220561 is a wasteful number, since it uses less digits than its factorization.

168368220561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935266935.

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 168368220561 in words is "one hundred sixty-eight billion, three hundred sixty-eight million, two hundred twenty thousand, five hundred sixty-one".