64185449 has 2 divisors, whose sum is σ = 64185450. Its totient is φ = 64185448.

The previous prime is 64185427. The next prime is 64185461. The reversal of 64185449 is 94458146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36517849 + 27667600 = 6043^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 64185449 - 2²⁰ = 63136873 is a prime.

It is equal to p_3795386 and since 64185449 and 3795386 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64155449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32092724 + 32092725.

It is an arithmetic number, because the mean of its divisors is an integer number (32092725).

Almost surely, 2^64185449 is an apocalyptic number.

It is an amenable number.

64185449 is a deficient number, since it is larger than the sum of its proper divisors (1).

64185449 is an equidigital number, since it uses as much as digits as its factorization.

64185449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 41.

The square root of 64185449 is about 8011.5821783216. The cubic root of 64185449 is about 400.3859795131.

The spelling of 64185449 in words is "sixty-four million, one hundred eighty-five thousand, four hundred forty-nine".