966991633921 has 4 divisors (see below), whose sum is σ = 972393822000. Its totient is φ = 961589445844.

The previous prime is 966991633913. The next prime is 966991633931. The reversal of 966991633921 is 129336199669.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 966991633921 - 2³ = 966991633913 is a prime.

It is a super-3 number, since 3×966991633921³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (966991633931) 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, 2701093771 + ... + 2701094128.

It is an arithmetic number, because the mean of its divisors is an integer number (243098455500).

Almost surely, 2^966991633921 is an apocalyptic number.

It is an amenable number.

966991633921 is a deficient number, since it is larger than the sum of its proper divisors (5402188079).

966991633921 is a wasteful number, since it uses less digits than its factorization.

966991633921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5402188078.

The product of its digits is 25509168, while the sum is 64.

The spelling of 966991633921 in words is "nine hundred sixty-six billion, nine hundred ninety-one million, six hundred thirty-three thousand, nine hundred twenty-one".