8921082645 has 12 divisors (see below), whose sum is σ = 15463209996. Its totient is φ = 4757910720.

The previous prime is 8921082641. The next prime is 8921082661. The reversal of 8921082645 is 5462801298.

It can be written as a sum of positive squares in 2 ways, for example, as 5477036049 + 3444046596 = 74007^2 + 58686^2 .

It is not a de Polignac number, because 8921082645 - 2² = 8921082641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 198246281 = 8921082645 / (8 + 9 + 2 + 1 + 0 + 8 + 2 + 6 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 8921082645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8921082641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99123096 + ... + 99123185.

It is an arithmetic number, because the mean of its divisors is an integer number (1288600833).

Almost surely, 2^8921082645 is an apocalyptic number.

It is an amenable number.

8921082645 is a deficient number, since it is larger than the sum of its proper divisors (6542127351).

8921082645 is a wasteful number, since it uses less digits than its factorization.

8921082645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198246292 (or 198246289 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 8921082645 is about 94451.4830217080. The cubic root of 8921082645 is about 2073.9861613245.

The spelling of 8921082645 in words is "eight billion, nine hundred twenty-one million, eighty-two thousand, six hundred forty-five".