68669537 has 2 divisors, whose sum is σ = 68669538. Its totient is φ = 68669536.

The previous prime is 68669509. The next prime is 68669539. The reversal of 68669537 is 73596686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 20214016 = 6961^2 + 4496^2 .

It is a cyclic number.

It is not a de Polignac number, because 68669537 - 2⁶ = 68669473 is a prime.

Together with 68669539, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68669539) 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, 34334768 + 34334769.

It is an arithmetic number, because the mean of its divisors is an integer number (34334769).

Almost surely, 2^68669537 is an apocalyptic number.

It is an amenable number.

68669537 is a deficient number, since it is larger than the sum of its proper divisors (1).

68669537 is an equidigital number, since it uses as much as digits as its factorization.

68669537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 50.

The square root of 68669537 is about 8286.7084539038. The cubic root of 68669537 is about 409.5007546141.

The spelling of 68669537 in words is "sixty-eight million, six hundred sixty-nine thousand, five hundred thirty-seven".