6516145139 has 4 divisors (see below), whose sum is σ = 7447023024. Its totient is φ = 5585267256.

The previous prime is 6516145123. The next prime is 6516145151. The reversal of 6516145139 is 9315416156.

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

It is a cyclic number.

It is not a de Polignac number, because 6516145139 - 2⁴ = 6516145123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6516145096 and 6516145105.

It is not an unprimeable number, because it can be changed into a prime (6516145039) 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, 465438932 + ... + 465438945.

It is an arithmetic number, because the mean of its divisors is an integer number (1861755756).

Almost surely, 2^6516145139 is an apocalyptic number.

6516145139 is a deficient number, since it is larger than the sum of its proper divisors (930877885).

6516145139 is an equidigital number, since it uses as much as digits as its factorization.

6516145139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930877884.

The product of its digits is 97200, while the sum is 41.

The square root of 6516145139 is about 80722.6432855119. The cubic root of 6516145139 is about 1867.7994780491.

The spelling of 6516145139 in words is "six billion, five hundred sixteen million, one hundred forty-five thousand, one hundred thirty-nine".