866772461 has 2 divisors, whose sum is σ = 866772462. Its totient is φ = 866772460.

The previous prime is 866772451. The next prime is 866772541. The reversal of 866772461 is 164277668.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 789947236 + 76825225 = 28106^2 + 8765^2 .

It is a cyclic number.

It is not a de Polignac number, because 866772461 - 2¹⁸ = 866510317 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866772451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433386230 + 433386231.

It is an arithmetic number, because the mean of its divisors is an integer number (433386231).

Almost surely, 2^866772461 is an apocalyptic number.

It is an amenable number.

866772461 is a deficient number, since it is larger than the sum of its proper divisors (1).

866772461 is an equidigital number, since it uses as much as digits as its factorization.

866772461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 47.

The square root of 866772461 is about 29440.9996603376. Note that the first 3 decimals coincide. The cubic root of 866772461 is about 953.4582951777.

The spelling of 866772461 in words is "eight hundred sixty-six million, seven hundred seventy-two thousand, four hundred sixty-one".