866501479979 has 2 divisors, whose sum is σ = 866501479980. Its totient is φ = 866501479978.

The previous prime is 866501479919. The next prime is 866501479997. The reversal of 866501479979 is 979974105668.

Together with next prime (866501479997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866501479979 is a prime.

It is not a weakly prime, because it can be changed into another prime (866501479919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433250739989 + 433250739990.

It is an arithmetic number, because the mean of its divisors is an integer number (433250739990).

Almost surely, 2^866501479979 is an apocalyptic number.

866501479979 is a deficient number, since it is larger than the sum of its proper divisors (1).

866501479979 is an equidigital number, since it uses as much as digits as its factorization.

866501479979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 205752960, while the sum is 71.

The spelling of 866501479979 in words is "eight hundred sixty-six billion, five hundred one million, four hundred seventy-nine thousand, nine hundred seventy-nine".