2028000661 has 2 divisors, whose sum is σ = 2028000662. Its totient is φ = 2028000660.

The previous prime is 2028000649. The next prime is 2028000679. The reversal of 2028000661 is 1660008202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1976247025 + 51753636 = 44455^2 + 7194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2028000661 is a prime.

It is a super-2 number, since 2×2028000661² = 8225573362032873842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2028000061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1014000330 + 1014000331.

It is an arithmetic number, because the mean of its divisors is an integer number (1014000331).

Almost surely, 2^2028000661 is an apocalyptic number.

It is an amenable number.

2028000661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2028000661 is an equidigital number, since it uses as much as digits as its factorization.

2028000661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2028000661 is about 45033.3283358004. The cubic root of 2028000661 is about 1265.7735921384.

Adding to 2028000661 its reverse (1660008202), we get a palindrome (3688008863).

The spelling of 2028000661 in words is "two billion, twenty-eight million, six hundred sixty-one", and thus it is an aban number.