6450990545 has 4 divisors (see below), whose sum is σ = 7741188660. Its totient is φ = 5160792432.

The previous prime is 6450990541. The next prime is 6450990551. The reversal of 6450990545 is 5450990546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 664041361 + 5786949184 = 25769^2 + 76072^2 .

It is a cyclic number.

It is not a de Polignac number, because 6450990545 - 2² = 6450990541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6450990545.

It is not an unprimeable number, because it can be changed into a prime (6450990541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645099050 + ... + 645099059.

It is an arithmetic number, because the mean of its divisors is an integer number (1935297165).

Almost surely, 2^6450990545 is an apocalyptic number.

It is an amenable number.

6450990545 is a deficient number, since it is larger than the sum of its proper divisors (1290198115).

6450990545 is a wasteful number, since it uses less digits than its factorization.

6450990545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290198114.

The product of its (nonzero) digits is 972000, while the sum is 47.

The square root of 6450990545 is about 80318.0586481023. The cubic root of 6450990545 is about 1861.5532700002.

Subtracting from 6450990545 its reverse (5450990546), we obtain a palindrome (999999999).

The spelling of 6450990545 in words is "six billion, four hundred fifty million, nine hundred ninety thousand, five hundred forty-five".