866378477 has 2 divisors, whose sum is σ = 866378478. Its totient is φ = 866378476.

The previous prime is 866378459. The next prime is 866378501. The reversal of 866378477 is 774873668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 766957636 + 99420841 = 27694^2 + 9971^2 .

It is a cyclic number.

It is not a de Polignac number, because 866378477 - 2⁶ = 866378413 is a prime.

It is a super-2 number, since 2×866378477² = 1501223330817679058, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866378377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433189238 + 433189239.

It is an arithmetic number, because the mean of its divisors is an integer number (433189239).

Almost surely, 2^866378477 is an apocalyptic number.

It is an amenable number.

866378477 is a deficient number, since it is larger than the sum of its proper divisors (1).

866378477 is an equidigital number, since it uses as much as digits as its factorization.

866378477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9483264, while the sum is 56.

The square root of 866378477 is about 29434.3078226752. The cubic root of 866378477 is about 953.3138111830.

The spelling of 866378477 in words is "eight hundred sixty-six million, three hundred seventy-eight thousand, four hundred seventy-seven".