866263693 has 2 divisors, whose sum is σ = 866263694. Its totient is φ = 866263692.

The previous prime is 866263649. The next prime is 866263753. The reversal of 866263693 is 396362668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 564442564 + 301821129 = 23758^2 + 17373^2 .

It is a cyclic number.

It is not a de Polignac number, because 866263693 - 2¹³ = 866255501 is a prime.

It is a super-3 number, since 3×866263693³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866263603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433131846 + 433131847.

It is an arithmetic number, because the mean of its divisors is an integer number (433131847).

Almost surely, 2^866263693 is an apocalyptic number.

It is an amenable number.

866263693 is a deficient number, since it is larger than the sum of its proper divisors (1).

866263693 is an equidigital number, since it uses as much as digits as its factorization.

866263693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 49.

The square root of 866263693 is about 29432.3579245700. The cubic root of 866263693 is about 953.2717087192.

The spelling of 866263693 in words is "eight hundred sixty-six million, two hundred sixty-three thousand, six hundred ninety-three".