7561656673 has 4 divisors (see below), whose sum is σ = 7631029780. Its totient is φ = 7492283568.

The previous prime is 7561656659. The next prime is 7561656677. The reversal of 7561656673 is 3766561657.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3766561657 = 18797 ⋅200381.

It can be written as a sum of positive squares in 2 ways, for example, as 6742380544 + 819276129 = 82112^2 + 28623^2 .

It is a cyclic number.

It is not a de Polignac number, because 7561656673 - 2⁹ = 7561656161 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 7561656673.

It is not an unprimeable number, because it can be changed into a prime (7561656677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34686390 + ... + 34686607.

It is an arithmetic number, because the mean of its divisors is an integer number (1907757445).

Almost surely, 2^7561656673 is an apocalyptic number.

It is an amenable number.

7561656673 is a deficient number, since it is larger than the sum of its proper divisors (69373107).

7561656673 is a wasteful number, since it uses less digits than its factorization.

7561656673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69373106.

The product of its digits is 4762800, while the sum is 52.

The square root of 7561656673 is about 86957.7867301141. The cubic root of 7561656673 is about 1962.7831377387.

The spelling of 7561656673 in words is "seven billion, five hundred sixty-one million, six hundred fifty-six thousand, six hundred seventy-three".