866293997 has 2 divisors, whose sum is σ = 866293998. Its totient is φ = 866293996.

The previous prime is 866293943. The next prime is 866294017. The reversal of 866293997 is 799392668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514881481 + 351412516 = 22691^2 + 18746^2 .

It is a cyclic number.

It is not a de Polignac number, because 866293997 - 2¹² = 866289901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866293937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433146998 + 433146999.

It is an arithmetic number, because the mean of its divisors is an integer number (433146999).

Almost surely, 2^866293997 is an apocalyptic number.

It is an amenable number.

866293997 is a deficient number, since it is larger than the sum of its proper divisors (1).

866293997 is an equidigital number, since it uses as much as digits as its factorization.

866293997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 59.

The square root of 866293997 is about 29432.8727276153. The cubic root of 866293997 is about 953.2828245066.

The spelling of 866293997 in words is "eight hundred sixty-six million, two hundred ninety-three thousand, nine hundred ninety-seven".