6516899780 has 24 divisors (see below), whose sum is σ = 13687071552. Its totient is φ = 2606458592.

The previous prime is 6516899761. The next prime is 6516899783. The reversal of 6516899780 is 879986156.

It is not an unprimeable number, because it can be changed into a prime (6516899783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257159 + ... + 281361.

It is an arithmetic number, because the mean of its divisors is an integer number (570294648).

Almost surely, 2^6516899780 is an apocalyptic number.

It is an amenable number.

6516899780 is an abundant number, since it is smaller than the sum of its proper divisors (7170171772).

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

6516899780 is a wasteful number, since it uses less digits than its factorization.

6516899780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37675 (or 37673 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 6516899780 is about 80727.3174334438. The cubic root of 6516899780 is about 1867.8715791471.

The spelling of 6516899780 in words is "six billion, five hundred sixteen million, eight hundred ninety-nine thousand, seven hundred eighty".