64416643 has 2 divisors, whose sum is σ = 64416644. Its totient is φ = 64416642.

The previous prime is 64416637. The next prime is 64416647. The reversal of 64416643 is 34661446.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64416643 is a prime.

It is a super-3 number, since 3×64416643³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64416599 and 64416608.

It is not a weakly prime, because it can be changed into another prime (64416647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32208321 + 32208322.

It is an arithmetic number, because the mean of its divisors is an integer number (32208322).

Almost surely, 2^64416643 is an apocalyptic number.

64416643 is a deficient number, since it is larger than the sum of its proper divisors (1).

64416643 is an equidigital number, since it uses as much as digits as its factorization.

64416643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 34.

The square root of 64416643 is about 8025.9979441811. The cubic root of 64416643 is about 400.8661294458.

The spelling of 64416643 in words is "sixty-four million, four hundred sixteen thousand, six hundred forty-three".