8516888621 has 4 divisors (see below), whose sum is σ = 8520096732. Its totient is φ = 8513680512.

The previous prime is 8516888603. The next prime is 8516888663. The reversal of 8516888621 is 1268886158.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7148702500 + 1368186121 = 84550^2 + 36989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8516888621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8516888321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600070 + ... + 1605383.

It is an arithmetic number, because the mean of its divisors is an integer number (2130024183).

Almost surely, 2^8516888621 is an apocalyptic number.

It is an amenable number.

8516888621 is a deficient number, since it is larger than the sum of its proper divisors (3208111).

8516888621 is a wasteful number, since it uses less digits than its factorization.

8516888621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208110.

The product of its digits is 1474560, while the sum is 53.

The square root of 8516888621 is about 92286.9905295432. The cubic root of 8516888621 is about 2042.1782945234.

The spelling of 8516888621 in words is "eight billion, five hundred sixteen million, eight hundred eighty-eight thousand, six hundred twenty-one".