67989553 has 2 divisors, whose sum is σ = 67989554. Its totient is φ = 67989552.

The previous prime is 67989539. The next prime is 67989557. The reversal of 67989553 is 35598976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67765824 + 223729 = 8232^2 + 473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67989553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67989553.

It is not a weakly prime, because it can be changed into another prime (67989557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33994776 + 33994777.

It is an arithmetic number, because the mean of its divisors is an integer number (33994777).

Almost surely, 2^67989553 is an apocalyptic number.

It is an amenable number.

67989553 is a deficient number, since it is larger than the sum of its proper divisors (1).

67989553 is an equidigital number, since it uses as much as digits as its factorization.

67989553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 52.

The square root of 67989553 is about 8245.5777844855. The cubic root of 67989553 is about 408.1446066453.

The spelling of 67989553 in words is "sixty-seven million, nine hundred eighty-nine thousand, five hundred fifty-three".