1333990661 has 2 divisors, whose sum is σ = 1333990662. Its totient is φ = 1333990660.

The previous prime is 1333990643. The next prime is 1333990673. The reversal of 1333990661 is 1660993331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1281210436 + 52780225 = 35794^2 + 7265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1333990661 - 2⁶ = 1333990597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1333990621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 666995330 + 666995331.

It is an arithmetic number, because the mean of its divisors is an integer number (666995331).

Almost surely, 2^1333990661 is an apocalyptic number.

It is an amenable number.

1333990661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1333990661 is an equidigital number, since it uses as much as digits as its factorization.

1333990661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 1333990661 is about 36523.8368877094. The cubic root of 1333990661 is about 1100.8232572614.

The spelling of 1333990661 in words is "one billion, three hundred thirty-three million, nine hundred ninety thousand, six hundred sixty-one".