2075817661 has 2 divisors, whose sum is σ = 2075817662. Its totient is φ = 2075817660.

The previous prime is 2075817637. The next prime is 2075817671. The reversal of 2075817661 is 1667185702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1709822500 + 365995161 = 41350^2 + 19131^2 .

It is a cyclic number.

It is not a de Polignac number, because 2075817661 - 2²⁹ = 1538946749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2075817631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1037908830 + 1037908831.

It is an arithmetic number, because the mean of its divisors is an integer number (1037908831).

Almost surely, 2^2075817661 is an apocalyptic number.

It is an amenable number.

2075817661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2075817661 is an equidigital number, since it uses as much as digits as its factorization.

2075817661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 2075817661 is about 45561.1420071973. The cubic root of 2075817661 is about 1275.6447152820.

The spelling of 2075817661 in words is "two billion, seventy-five million, eight hundred seventeen thousand, six hundred sixty-one".