6405503551 has 2 divisors, whose sum is σ = 6405503552. Its totient is φ = 6405503550.

The previous prime is 6405503537. The next prime is 6405503561. The reversal of 6405503551 is 1553055046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6405503551 - 2²⁵ = 6371949119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6405503561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202751775 + 3202751776.

It is an arithmetic number, because the mean of its divisors is an integer number (3202751776).

Almost surely, 2^6405503551 is an apocalyptic number.

6405503551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405503551 is an equidigital number, since it uses as much as digits as its factorization.

6405503551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45000, while the sum is 34.

The square root of 6405503551 is about 80034.3898021344. The cubic root of 6405503551 is about 1857.1675730701.

Adding to 6405503551 its reverse (1553055046), we get a palindrome (7958558597).

The spelling of 6405503551 in words is "six billion, four hundred five million, five hundred three thousand, five hundred fifty-one".