7561663 has 4 divisors (see below), whose sum is σ = 7822440. Its totient is φ = 7300888.

The previous prime is 7561633. The next prime is 7561681. The reversal of 7561663 is 3661657.

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: 3661657 = 389 ⋅9413.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7561663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7561633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130345 + ... + 130402.

It is an arithmetic number, because the mean of its divisors is an integer number (1955610).

Almost surely, 2^7561663 is an apocalyptic number.

7561663 is a deficient number, since it is larger than the sum of its proper divisors (260777).

7561663 is a wasteful number, since it uses less digits than its factorization.

7561663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260776.

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

The square root of 7561663 is about 2749.8478139708. The cubic root of 7561663 is about 196.2783685173.

The spelling of 7561663 in words is "seven million, five hundred sixty-one thousand, six hundred sixty-three".