168993577 has 2 divisors, whose sum is σ = 168993578. Its totient is φ = 168993576.

The previous prime is 168993571. The next prime is 168993593. The reversal of 168993577 is 775399861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98029801 + 70963776 = 9901^2 + 8424^2 .

It is a cyclic number.

It is not a de Polignac number, because 168993577 - 2⁷ = 168993449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168993571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84496788 + 84496789.

It is an arithmetic number, because the mean of its divisors is an integer number (84496789).

Almost surely, 2^168993577 is an apocalyptic number.

It is an amenable number.

168993577 is a deficient number, since it is larger than the sum of its proper divisors (1).

168993577 is an equidigital number, since it uses as much as digits as its factorization.

168993577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 55.

The square root of 168993577 is about 12999.7529591912. The cubic root of 168993577 is about 552.8704770739.

It can be divided in two parts, 1689 and 93577, that added together give a triangular number (95266 = T₄₃₆).

The spelling of 168993577 in words is "one hundred sixty-eight million, nine hundred ninety-three thousand, five hundred seventy-seven".