8516757821 has 16 divisors (see below), whose sum is σ = 10077708480. Its totient is φ = 7095496320.

The previous prime is 8516757817. The next prime is 8516757833. The reversal of 8516757821 is 1287576158.

It is not a de Polignac number, because 8516757821 - 2² = 8516757817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8516757821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8516757721) 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, 194360 + ... + 234113.

It is an arithmetic number, because the mean of its divisors is an integer number (629856780).

Almost surely, 2^8516757821 is an apocalyptic number.

It is an amenable number.

8516757821 is a deficient number, since it is larger than the sum of its proper divisors (1560950659).

8516757821 is a wasteful number, since it uses less digits than its factorization.

8516757821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428636.

The product of its digits is 940800, while the sum is 50.

The square root of 8516757821 is about 92286.2818678919. The cubic root of 8516757821 is about 2042.1678400683.

The spelling of 8516757821 in words is "eight billion, five hundred sixteen million, seven hundred fifty-seven thousand, eight hundred twenty-one".