168321977 has 2 divisors, whose sum is σ = 168321978. Its totient is φ = 168321976.

The previous prime is 168321953. The next prime is 168322019. The reversal of 168321977 is 779123861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151314601 + 17007376 = 12301^2 + 4124^2 .

It is a cyclic number.

It is not a de Polignac number, because 168321977 - 2¹⁶ = 168256441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168321577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84160988 + 84160989.

It is an arithmetic number, because the mean of its divisors is an integer number (84160989).

Almost surely, 2^168321977 is an apocalyptic number.

It is an amenable number.

168321977 is a deficient number, since it is larger than the sum of its proper divisors (1).

168321977 is an equidigital number, since it uses as much as digits as its factorization.

168321977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 168321977 is about 12973.8959838593. The cubic root of 168321977 is about 552.1371143405.

The spelling of 168321977 in words is "one hundred sixty-eight million, three hundred twenty-one thousand, nine hundred seventy-seven".