976655543221 has 16 divisors (see below), whose sum is σ = 991084155120. Its totient is φ = 962305850880.

The previous prime is 976655543189. The next prime is 976655543233. The reversal of 976655543221 is 122345556679.

It can be written as a sum of positive squares in 8 ways, for example, as 35055072900 + 941600470321 = 187230^2 + 970361^2 .

It is a cyclic number.

It is not a de Polignac number, because 976655543221 - 2⁵ = 976655543189 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 (976655543321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146619631 + ... + 146626291.

It is an arithmetic number, because the mean of its divisors is an integer number (61942759695).

Almost surely, 2^976655543221 is an apocalyptic number.

It is an amenable number.

976655543221 is a deficient number, since it is larger than the sum of its proper divisors (14428611899).

976655543221 is a wasteful number, since it uses less digits than its factorization.

976655543221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12264.

The product of its digits is 13608000, while the sum is 55.

The spelling of 976655543221 in words is "nine hundred seventy-six billion, six hundred fifty-five million, five hundred forty-three thousand, two hundred twenty-one".