5631121966 has 8 divisors (see below), whose sum is σ = 8449132464. Its totient is φ = 2814744480.

The previous prime is 5631121949. The next prime is 5631121987. The reversal of 5631121966 is 6691211365.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 399595 + ... + 413446.

It is an arithmetic number, because the mean of its divisors is an integer number (1056141558).

Almost surely, 2^5631121966 is an apocalyptic number.

5631121966 is a deficient number, since it is larger than the sum of its proper divisors (2818010498).

5631121966 is a wasteful number, since it uses less digits than its factorization.

5631121966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816506.

The product of its digits is 58320, while the sum is 40.

The square root of 5631121966 is about 75040.8020079743. The cubic root of 5631121966 is about 1779.0916088370.

The spelling of 5631121966 in words is "five billion, six hundred thirty-one million, one hundred twenty-one thousand, nine hundred sixty-six".