71866369 has 2 divisors, whose sum is σ = 71866370. Its totient is φ = 71866368.

The previous prime is 71866351. The next prime is 71866391. The reversal of 71866369 is 96366817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40640625 + 31225744 = 6375^2 + 5588^2 .

It is a cyclic number.

It is not a de Polignac number, because 71866369 - 2¹⁷ = 71735297 is a prime.

It is a super-2 number, since 2×71866369² = 10329549986488322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71866969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35933184 + 35933185.

It is an arithmetic number, because the mean of its divisors is an integer number (35933185).

Almost surely, 2^71866369 is an apocalyptic number.

It is an amenable number.

71866369 is a deficient number, since it is larger than the sum of its proper divisors (1).

71866369 is an equidigital number, since it uses as much as digits as its factorization.

71866369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 71866369 is about 8477.4034350148. The cubic root of 71866369 is about 415.7592314396.

The spelling of 71866369 in words is "seventy-one million, eight hundred sixty-six thousand, three hundred sixty-nine".