7931538663 has 4 divisors (see below), whose sum is σ = 10575384888. Its totient is φ = 5287692440.

The previous prime is 7931538623. The next prime is 7931538689. The reversal of 7931538663 is 3668351397.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7931538663 - 2¹⁰ = 7931537639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7931538613) 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, 1321923108 + ... + 1321923113.

It is an arithmetic number, because the mean of its divisors is an integer number (2643846222).

Almost surely, 2^7931538663 is an apocalyptic number.

7931538663 is a deficient number, since it is larger than the sum of its proper divisors (2643846225).

7931538663 is a wasteful number, since it uses less digits than its factorization.

7931538663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643846224.

The product of its digits is 2449440, while the sum is 51.

The square root of 7931538663 is about 89059.1862920384. The cubic root of 7931538663 is about 1994.2785366195.

The spelling of 7931538663 in words is "seven billion, nine hundred thirty-one million, five hundred thirty-eight thousand, six hundred sixty-three".