6516454578 has 32 divisors (see below), whose sum is σ = 13399862784. Its totient is φ = 2111121792.

The previous prime is 6516454561. The next prime is 6516454589. The reversal of 6516454578 is 8754546156.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6516454578.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192351 + ... + 223677.

It is an arithmetic number, because the mean of its divisors is an integer number (418745712).

Almost surely, 2^6516454578 is an apocalyptic number.

6516454578 is an abundant number, since it is smaller than the sum of its proper divisors (6883408206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6516454578 is a wasteful number, since it uses less digits than its factorization.

6516454578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32306.

The product of its digits is 4032000, while the sum is 51.

The square root of 6516454578 is about 80724.5599430557. The cubic root of 6516454578 is about 1867.8290436303.

The spelling of 6516454578 in words is "six billion, five hundred sixteen million, four hundred fifty-four thousand, five hundred seventy-eight".