521365667 has 2 divisors, whose sum is σ = 521365668. Its totient is φ = 521365666.

The previous prime is 521365661. The next prime is 521365711. The reversal of 521365667 is 766563125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521365667 - 2⁴ = 521365651 is a prime.

It is not a weakly prime, because it can be changed into another prime (521365661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260682833 + 260682834.

It is an arithmetic number, because the mean of its divisors is an integer number (260682834).

Almost surely, 2^521365667 is an apocalyptic number.

521365667 is a deficient number, since it is larger than the sum of its proper divisors (1).

521365667 is an equidigital number, since it uses as much as digits as its factorization.

521365667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 41.

The square root of 521365667 is about 22833.4330971057. The cubic root of 521365667 is about 804.8485071713.

The spelling of 521365667 in words is "five hundred twenty-one million, three hundred sixty-five thousand, six hundred sixty-seven".