6515138450 has 12 divisors (see below), whose sum is σ = 12118157610. Its totient is φ = 2606055360.

The previous prime is 6515138431. The next prime is 6515138459. The reversal of 6515138450 is 548315156.

It can be written as a sum of positive squares in 3 ways, for example, as 6230102761 + 285035689 = 78931^2 + 16883^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (6515138459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65151335 + ... + 65151434.

Almost surely, 2^6515138450 is an apocalyptic number.

6515138450 is a deficient number, since it is larger than the sum of its proper divisors (5603019160).

6515138450 is a wasteful number, since it uses less digits than its factorization.

6515138450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130302781 (or 130302776 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 6515138450 is about 80716.4075637661. The cubic root of 6515138450 is about 1867.7032867179.

The spelling of 6515138450 in words is "six billion, five hundred fifteen million, one hundred thirty-eight thousand, four hundred fifty".