71666977 has 2 divisors, whose sum is σ = 71666978. Its totient is φ = 71666976.

The previous prime is 71666957. The next prime is 71666981. The reversal of 71666977 is 77966617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54700816 + 16966161 = 7396^2 + 4119^2 .

It is a cyclic number.

It is not a de Polignac number, because 71666977 - 2¹⁹ = 71142689 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71666977.

It is not a weakly prime, because it can be changed into another prime (71666957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35833488 + 35833489.

It is an arithmetic number, because the mean of its divisors is an integer number (35833489).

Almost surely, 2^71666977 is an apocalyptic number.

It is an amenable number.

71666977 is a deficient number, since it is larger than the sum of its proper divisors (1).

71666977 is an equidigital number, since it uses as much as digits as its factorization.

71666977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 666792, while the sum is 49.

The square root of 71666977 is about 8465.6350618250. The cubic root of 71666977 is about 415.3743696859.

The spelling of 71666977 in words is "seventy-one million, six hundred sixty-six thousand, nine hundred seventy-seven".