64666741 has 2 divisors, whose sum is σ = 64666742. Its totient is φ = 64666740.

The previous prime is 64666733. The next prime is 64666753. The reversal of 64666741 is 14766646.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39012516 + 25654225 = 6246^2 + 5065^2 .

It is a cyclic number.

It is not a de Polignac number, because 64666741 - 2³ = 64666733 is a prime.

It is a super-2 number, since 2×64666741² = 8363574783122162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64666694 and 64666703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64661741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32333370 + 32333371.

It is an arithmetic number, because the mean of its divisors is an integer number (32333371).

Almost surely, 2^64666741 is an apocalyptic number.

It is an amenable number.

64666741 is a deficient number, since it is larger than the sum of its proper divisors (1).

64666741 is an equidigital number, since it uses as much as digits as its factorization.

64666741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 64666741 is about 8041.5633430322. The cubic root of 64666741 is about 401.3842478687.

The spelling of 64666741 in words is "sixty-four million, six hundred sixty-six thousand, seven hundred forty-one".