6511538042 has 4 divisors (see below), whose sum is σ = 9767307066. Its totient is φ = 3255769020.

The previous prime is 6511538039. The next prime is 6511538053. The reversal of 6511538042 is 2408351156.

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

It can be written as a sum of positive squares in only one way, i.e., 3907375081 + 2604162961 = 62509^2 + 51031^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6511537993 and 6511538011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1627884509 + ... + 1627884512.

Almost surely, 2^6511538042 is an apocalyptic number.

6511538042 is a deficient number, since it is larger than the sum of its proper divisors (3255769024).

6511538042 is a wasteful number, since it uses less digits than its factorization.

6511538042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255769023.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 6511538042 is about 80694.1016555733. The cubic root of 6511538042 is about 1867.3591787613.

Adding to 6511538042 its reverse (2408351156), we get a palindrome (8919889198).

The spelling of 6511538042 in words is "six billion, five hundred eleven million, five hundred thirty-eight thousand, forty-two".