7661563 has 16 divisors (see below), whose sum is σ = 9596160. Its totient is φ = 5954976.

The previous prime is 7661531. The next prime is 7661567. The reversal of 7661563 is 3651667.

It is a happy number.

7661563 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 7661563 - 2⁵ = 7661531 is a prime.

It is an Ulam number.

7661563 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7661567) 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 15 ways as a sum of consecutive naturals, for example, 4656 + ... + 6082.

It is an arithmetic number, because the mean of its divisors is an integer number (599760).

Almost surely, 2^7661563 is an apocalyptic number.

7661563 is a deficient number, since it is larger than the sum of its proper divisors (1934597).

7661563 is a wasteful number, since it uses less digits than its factorization.

7661563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506.

The product of its digits is 22680, while the sum is 34.

The square root of 7661563 is about 2767.9528536447. The cubic root of 7661563 is about 197.1389590502.

The spelling of 7661563 in words is "seven million, six hundred sixty-one thousand, five hundred sixty-three".