6450990551 has 2 divisors, whose sum is σ = 6450990552. Its totient is φ = 6450990550.

The previous prime is 6450990541. The next prime is 6450990563. The reversal of 6450990551 is 1550990546.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6450990551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6450990541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3225495275 + 3225495276.

It is an arithmetic number, because the mean of its divisors is an integer number (3225495276).

Almost surely, 2^6450990551 is an apocalyptic number.

6450990551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6450990551 is an equidigital number, since it uses as much as digits as its factorization.

6450990551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 6450990551 is about 80318.0586854538. The cubic root of 6450990551 is about 1861.5532705774.

The spelling of 6450990551 in words is "six billion, four hundred fifty million, nine hundred ninety thousand, five hundred fifty-one".