168315649 has 2 divisors, whose sum is σ = 168315650. Its totient is φ = 168315648.

The previous prime is 168315629. The next prime is 168315659. The reversal of 168315649 is 946513861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87890625 + 80425024 = 9375^2 + 8968^2 .

It is a cyclic number.

It is not a de Polignac number, because 168315649 - 2⁹ = 168315137 is a prime.

It is not a weakly prime, because it can be changed into another prime (168315629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84157824 + 84157825.

It is an arithmetic number, because the mean of its divisors is an integer number (84157825).

Almost surely, 2^168315649 is an apocalyptic number.

It is an amenable number.

168315649 is a deficient number, since it is larger than the sum of its proper divisors (1).

168315649 is an equidigital number, since it uses as much as digits as its factorization.

168315649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 168315649 is about 12973.6521072518. The cubic root of 168315649 is about 552.1301951263.

The spelling of 168315649 in words is "one hundred sixty-eight million, three hundred fifteen thousand, six hundred forty-nine".