2651561345 has 4 divisors (see below), whose sum is σ = 3181873620. Its totient is φ = 2121249072.

The previous prime is 2651561291. The next prime is 2651561357. The reversal of 2651561345 is 5431651562.

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 726194704 + 1925366641 = 26948^2 + 43879^2 .

It is a cyclic number.

It is not a de Polignac number, because 2651561345 - 2¹⁸ = 2651299201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2651561299 and 2651561308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265156130 + ... + 265156139.

It is an arithmetic number, because the mean of its divisors is an integer number (795468405).

Almost surely, 2^2651561345 is an apocalyptic number.

It is an amenable number.

2651561345 is a deficient number, since it is larger than the sum of its proper divisors (530312275).

2651561345 is an equidigital number, since it uses as much as digits as its factorization.

2651561345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530312274.

The product of its digits is 108000, while the sum is 38.

The square root of 2651561345 is about 51493.3135950679. The cubic root of 2651561345 is about 1384.0992279154.

The spelling of 2651561345 in words is "two billion, six hundred fifty-one million, five hundred sixty-one thousand, three hundred forty-five".