168722961 has 16 divisors (see below), whose sum is σ = 247802880. Its totient is φ = 101261520.

The previous prime is 168722881. The next prime is 168722993. The reversal of 168722961 is 169227861.

It is a de Polignac number, because none of the positive numbers 2^k-168722961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168522961) 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, 21421 + ... + 28218.

It is an arithmetic number, because the mean of its divisors is an integer number (15487680).

Almost surely, 2^168722961 is an apocalyptic number.

168722961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168722961 is a deficient number, since it is larger than the sum of its proper divisors (79079919).

168722961 is a wasteful number, since it uses less digits than its factorization.

168722961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49756.

The product of its digits is 72576, while the sum is 42.

The square root of 168722961 is about 12989.3402834786. The cubic root of 168722961 is about 552.5752083965.

The spelling of 168722961 in words is "one hundred sixty-eight million, seven hundred twenty-two thousand, nine hundred sixty-one".