8201561345 has 24 divisors (see below), whose sum is σ = 10792174848. Its totient is φ = 5976057600.

The previous prime is 8201561341. The next prime is 8201561351. The reversal of 8201561345 is 5431651028.

It is not a de Polignac number, because 8201561345 - 2² = 8201561341 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8201561341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46751 + ... + 136340.

It is an arithmetic number, because the mean of its divisors is an integer number (449673952).

Almost surely, 2^8201561345 is an apocalyptic number.

8201561345 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8201561345 is a deficient number, since it is larger than the sum of its proper divisors (2590613503).

8201561345 is a wasteful number, since it uses less digits than its factorization.

8201561345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183161 (or 183144 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 8201561345 is about 90562.4720565864. The cubic root of 8201561345 is about 2016.6576548406.

The spelling of 8201561345 in words is "eight billion, two hundred one million, five hundred sixty-one thousand, three hundred forty-five".