866771137 has 2 divisors, whose sum is σ = 866771138. Its totient is φ = 866771136.

The previous prime is 866771117. The next prime is 866771153. The reversal of 866771137 is 731177668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615833856 + 250937281 = 24816^2 + 15841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866771137 is a prime.

It is equal to p_44396794 and since 866771137 and 44396794 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (866771117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433385568 + 433385569.

It is an arithmetic number, because the mean of its divisors is an integer number (433385569).

Almost surely, 2^866771137 is an apocalyptic number.

It is an amenable number.

866771137 is a deficient number, since it is larger than the sum of its proper divisors (1).

866771137 is an equidigital number, since it uses as much as digits as its factorization.

866771137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 46.

The square root of 866771137 is about 29440.9771746795. The cubic root of 866771137 is about 953.4578097064.

The spelling of 866771137 in words is "eight hundred sixty-six million, seven hundred seventy-one thousand, one hundred thirty-seven".