6521242515139 has 16 divisors (see below), whose sum is σ = 7145348878080. Its totient is φ = 5902376931360.

The previous prime is 6521242515121. The next prime is 6521242515169. The reversal of 6521242515139 is 9315152421256.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6521242515139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6521242515119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3645154 + ... + 5131240.

It is an arithmetic number, because the mean of its divisors is an integer number (446584304880).

Almost surely, 2^{6521242515139} is an apocalyptic number.

6521242515139 is a deficient number, since it is larger than the sum of its proper divisors (624106362941).

6521242515139 is a wasteful number, since it uses less digits than its factorization.

6521242515139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487850.

The product of its digits is 648000, while the sum is 46.

The spelling of 6521242515139 in words is "six trillion, five hundred twenty-one billion, two hundred forty-two million, five hundred fifteen thousand, one hundred thirty-nine".