6516899779 has 8 divisors (see below), whose sum is σ = 7026576480. Its totient is φ = 6008419776.

The previous prime is 6516899761. The next prime is 6516899783. The reversal of 6516899779 is 9779986156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6516899779 - 2⁵ = 6516899747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6516899759) 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, 287842 + ... + 309655.

It is an arithmetic number, because the mean of its divisors is an integer number (878322060).

Almost surely, 2^6516899779 is an apocalyptic number.

6516899779 is a deficient number, since it is larger than the sum of its proper divisors (509676701).

6516899779 is a wasteful number, since it uses less digits than its factorization.

6516899779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598349.

The product of its digits is 51438240, while the sum is 67.

The square root of 6516899779 is about 80727.3174272501. The cubic root of 6516899779 is about 1867.8715790516.

The spelling of 6516899779 in words is "six billion, five hundred sixteen million, eight hundred ninety-nine thousand, seven hundred seventy-nine".