1004010661 has 2 divisors, whose sum is σ = 1004010662. Its totient is φ = 1004010660.

The previous prime is 1004010659. The next prime is 1004010677. The reversal of 1004010661 is 1660104001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1003685761 + 324900 = 31681^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004010661 - 2¹ = 1004010659 is a prime.

Together with 1004010659, 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 (1004010061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502005330 + 502005331.

It is an arithmetic number, because the mean of its divisors is an integer number (502005331).

Almost surely, 2^1004010661 is an apocalyptic number.

It is an amenable number.

1004010661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004010661 is an equidigital number, since it uses as much as digits as its factorization.

1004010661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1004010661 is about 31686.1272641514. The cubic root of 1004010661 is about 1001.3351037048.

Adding to 1004010661 its reverse (1660104001), we get a palindrome (2664114662).

The spelling of 1004010661 in words is "one billion, four million, ten thousand, six hundred sixty-one".