866620397387 has 2 divisors, whose sum is σ = 866620397388. Its totient is φ = 866620397386.

The previous prime is 866620397341. The next prime is 866620397413. The reversal of 866620397387 is 783793026668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866620397387 - 2¹² = 866620393291 is a prime.

It is not a weakly prime, because it can be changed into another prime (866620397987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433310198693 + 433310198694.

It is an arithmetic number, because the mean of its divisors is an integer number (433310198694).

Almost surely, 2^866620397387 is an apocalyptic number.

866620397387 is a deficient number, since it is larger than the sum of its proper divisors (1).

866620397387 is an equidigital number, since it uses as much as digits as its factorization.

866620397387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109734912, while the sum is 65.

The spelling of 866620397387 in words is "eight hundred sixty-six billion, six hundred twenty million, three hundred ninety-seven thousand, three hundred eighty-seven".