64685669 has 2 divisors, whose sum is σ = 64685670. Its totient is φ = 64685668.

The previous prime is 64685617. The next prime is 64685713. The reversal of 64685669 is 96658646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 925444 = 7985^2 + 962^2 .

It is a cyclic number.

It is not a de Polignac number, because 64685669 - 2²⁴ = 47908453 is a prime.

It is a super-2 number, since 2×64685669² = 8368471547955122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64885669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32342834 + 32342835.

It is an arithmetic number, because the mean of its divisors is an integer number (32342835).

Almost surely, 2^64685669 is an apocalyptic number.

It is an amenable number.

64685669 is a deficient number, since it is larger than the sum of its proper divisors (1).

64685669 is an equidigital number, since it uses as much as digits as its factorization.

64685669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 50.

The square root of 64685669 is about 8042.7401425136. The cubic root of 64685669 is about 401.4234058645.

The spelling of 64685669 in words is "sixty-four million, six hundred eighty-five thousand, six hundred sixty-nine".