1670020081 has 2 divisors, whose sum is σ = 1670020082. Its totient is φ = 1670020080.

The previous prime is 1670020069. The next prime is 1670020171. The reversal of 1670020081 is 1800200761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1406250000 + 263770081 = 37500^2 + 16241^2 .

It is an emirp because it is prime and its reverse (1800200761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1670020081 - 2¹¹ = 1670018033 is a prime.

It is a super-2 number, since 2×1670020081² = 5577934141886493122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1670020031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835010040 + 835010041.

It is an arithmetic number, because the mean of its divisors is an integer number (835010041).

Almost surely, 2^1670020081 is an apocalyptic number.

It is an amenable number.

1670020081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670020081 is an equidigital number, since it uses as much as digits as its factorization.

1670020081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1670020081 is about 40865.8791781114. The cubic root of 1670020081 is about 1186.4257512427.

The spelling of 1670020081 in words is "one billion, six hundred seventy million, twenty thousand, eighty-one".