64818643 has 2 divisors, whose sum is σ = 64818644. Its totient is φ = 64818642.

The previous prime is 64818571. The next prime is 64818653. The reversal of 64818643 is 34681846.

64818643 is nontrivially palindromic in base 16.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64818643 is a prime.

It is a super-2 number, since 2×64818643² = 8402912960722898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64818596 and 64818605.

It is not a weakly prime, because it can be changed into another prime (64818653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32409321 + 32409322.

It is an arithmetic number, because the mean of its divisors is an integer number (32409322).

Almost surely, 2^64818643 is an apocalyptic number.

64818643 is a deficient number, since it is larger than the sum of its proper divisors (1).

64818643 is an equidigital number, since it uses as much as digits as its factorization.

64818643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 40.

The square root of 64818643 is about 8051.0026083712. The cubic root of 64818643 is about 401.6982856105.

It can be divided in two parts, 648 and 18643, that added together give a palindrome (19291).

The spelling of 64818643 in words is "sixty-four million, eight hundred eighteen thousand, six hundred forty-three".