6516816545 has 16 divisors (see below), whose sum is σ = 8014930560. Its totient is φ = 5083747200.

The previous prime is 6516816541. The next prime is 6516816557. The reversal of 6516816545 is 5456186156.

It is not a de Polignac number, because 6516816545 - 2² = 6516816541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6516816545.

It is not an unprimeable number, because it can be changed into a prime (6516816541) 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, 472700 + ... + 486290.

It is an arithmetic number, because the mean of its divisors is an integer number (500933160).

Almost surely, 2^6516816545 is an apocalyptic number.

It is an amenable number.

6516816545 is a deficient number, since it is larger than the sum of its proper divisors (1498114015).

6516816545 is a wasteful number, since it uses less digits than its factorization.

6516816545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15976.

The product of its digits is 864000, while the sum is 47.

The square root of 6516816545 is about 80726.8018999886. The cubic root of 6516816545 is about 1867.8636268509.

The spelling of 6516816545 in words is "six billion, five hundred sixteen million, eight hundred sixteen thousand, five hundred forty-five".