676664521 has 16 divisors (see below), whose sum is σ = 750872080. Its totient is φ = 605905920.

The previous prime is 676664519. The next prime is 676664539. The reversal of 676664521 is 125466676.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9217296 + 667447225 = 3036^2 + 25835^2 .

It is a cyclic number.

It is not a de Polignac number, because 676664521 - 2¹ = 676664519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (676664581) 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, 52045 + ... + 63733.

It is an arithmetic number, because the mean of its divisors is an integer number (46929505).

Almost surely, 2^676664521 is an apocalyptic number.

676664521 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

676664521 is a deficient number, since it is larger than the sum of its proper divisors (74207559).

676664521 is a wasteful number, since it uses less digits than its factorization.

676664521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11836.

The product of its digits is 362880, while the sum is 43.

The square root of 676664521 is about 26012.7761109805. The cubic root of 676664521 is about 877.9257797934.

The spelling of 676664521 in words is "six hundred seventy-six million, six hundred sixty-four thousand, five hundred twenty-one".