511450643623 has 2 divisors, whose sum is σ = 511450643624. Its totient is φ = 511450643622.

The previous prime is 511450643617. The next prime is 511450643633. The reversal of 511450643623 is 326346054115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 511450643623 - 2⁹ = 511450643111 is a prime.

It is a super-2 number, since 2×511450643623² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511450643603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255725321811 + 255725321812.

It is an arithmetic number, because the mean of its divisors is an integer number (255725321812).

Almost surely, 2^511450643623 is an apocalyptic number.

511450643623 is a deficient number, since it is larger than the sum of its proper divisors (1).

511450643623 is an equidigital number, since it uses as much as digits as its factorization.

511450643623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 511450643623 its reverse (326346054115), we get a palindrome (837796697738).

The spelling of 511450643623 in words is "five hundred eleven billion, four hundred fifty million, six hundred forty-three thousand, six hundred twenty-three".