976664881 has 2 divisors, whose sum is σ = 976664882.
Its totient is φ = 976664880.
The previous prime is 976664879. The next prime is 976664903. The reversal of 976664881 is 188466679.
It can be divided in two parts, 9766 and 64881, that added together give a palindrome (74647).
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 972441856 + 4223025 = 31184^2 + 2055^2
It is a cyclic number.
It is not a de Polignac number, because 976664881 - 21 = 976664879 is a prime.
It is a super-2 number, since 2×9766648812 = 1907748579557488322, which contains 22 as substring.
Together with 976664879, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (976664831) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488332440 + 488332441.
It is an arithmetic number, because the mean of its divisors is an integer number (488332441).
Almost surely, 2976664881 is an apocalyptic number.
It is an amenable number.
976664881 is a deficient number, since it is larger than the sum of its proper divisors (1).
976664881 is an equidigital number, since it uses as much as digits as its factorization.
976664881 is an evil number, because the sum of its binary digits is even.
The product of its digits is 3483648, while the sum is 55.
The square root of 976664881 is about 31251.6380530685.
The cubic root of 976664881 is about 992.1603271394.
The spelling of 976664881 in words is "nine hundred seventy-six million, six hundred sixty-four thousand, eight hundred eighty-one".