6516399456 has 180 divisors, whose sum is σ = 22293890388. Its totient is φ = 1861792128.

The previous prime is 6516399433. The next prime is 6516399473. The reversal of 6516399456 is 6549936156.

6516399456 is a `hidden beast` number, since 6 + 516 + 39 + 94 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 101355 + ... + 152661.

Almost surely, 2^6516399456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6516399456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11146945194).

6516399456 is an abundant number, since it is smaller than the sum of its proper divisors (15777490932).

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

6516399456 is a wasteful number, since it uses less digits than its factorization.

6516399456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51343 (or 51319 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 54.

The square root of 6516399456 is about 80724.2185220768. The cubic root of 6516399456 is about 1867.8237770260.

The spelling of 6516399456 in words is "six billion, five hundred sixteen million, three hundred ninety-nine thousand, four hundred fifty-six".