1666672177 has 2 divisors, whose sum is σ = 1666672178. Its totient is φ = 1666672176.

The previous prime is 1666672109. The next prime is 1666672223. The reversal of 1666672177 is 7712766661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1208883361 + 457788816 = 34769^2 + 21396^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666672177 - 2²³ = 1658283569 is a prime.

It is a super-2 number, since 2×1666672177² = 5555592291171838658, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1666672177.

It is not a weakly prime, because it can be changed into another prime (1666672277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833336088 + 833336089.

It is an arithmetic number, because the mean of its divisors is an integer number (833336089).

Almost surely, 2^1666672177 is an apocalyptic number.

It is an amenable number.

1666672177 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666672177 is an equidigital number, since it uses as much as digits as its factorization.

1666672177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 1666672177 is about 40824.8965338554. The cubic root of 1666672177 is about 1185.6324081398.

The spelling of 1666672177 in words is "one billion, six hundred sixty-six million, six hundred seventy-two thousand, one hundred seventy-seven".