1675166821 has 2 divisors, whose sum is σ = 1675166822. Its totient is φ = 1675166820.

The previous prime is 1675166819. The next prime is 1675166833. The reversal of 1675166821 is 1286615761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1148464321 + 526702500 = 33889^2 + 22950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1675166821 - 2¹ = 1675166819 is a prime.

Together with 1675166819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1675166851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 837583410 + 837583411.

It is an arithmetic number, because the mean of its divisors is an integer number (837583411).

Almost surely, 2^1675166821 is an apocalyptic number.

It is an amenable number.

1675166821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1675166821 is an equidigital number, since it uses as much as digits as its factorization.

1675166821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 1675166821 is about 40928.8018515079. The cubic root of 1675166821 is about 1187.6432940434.

The spelling of 1675166821 in words is "one billion, six hundred seventy-five million, one hundred sixty-six thousand, eight hundred twenty-one".