866247021047 has 2 divisors, whose sum is σ = 866247021048. Its totient is φ = 866247021046.

The previous prime is 866247020983. The next prime is 866247021053. The reversal of 866247021047 is 740120742668.

866247021047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866247021047 - 2⁶ = 866247020983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866247020992 and 866247021010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866247021097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433123510523 + 433123510524.

It is an arithmetic number, because the mean of its divisors is an integer number (433123510524).

Almost surely, 2^866247021047 is an apocalyptic number.

866247021047 is a deficient number, since it is larger than the sum of its proper divisors (1).

866247021047 is an equidigital number, since it uses as much as digits as its factorization.

866247021047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 47.

The spelling of 866247021047 in words is "eight hundred sixty-six billion, two hundred forty-seven million, twenty-one thousand, forty-seven".