976665443221 has 16 divisors (see below), whose sum is σ = 1054571902720. Its totient is φ = 899156764800.

The previous prime is 976665443209. The next prime is 976665443227. The reversal of 976665443221 is 122344566679.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 976665443221 - 2³³ = 968075508629 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (976665443227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32689936 + ... + 32719798.

It is an arithmetic number, because the mean of its divisors is an integer number (65910743920).

Almost surely, 2^976665443221 is an apocalyptic number.

It is an amenable number.

976665443221 is a deficient number, since it is larger than the sum of its proper divisors (77906459499).

976665443221 is a wasteful number, since it uses less digits than its factorization.

976665443221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36436.

The product of its digits is 13063680, while the sum is 55.

The spelling of 976665443221 in words is "nine hundred seventy-six billion, six hundred sixty-five million, four hundred forty-three thousand, two hundred twenty-one".