381450661633 has 2 divisors, whose sum is σ = 381450661634. Its totient is φ = 381450661632.

The previous prime is 381450661583. The next prime is 381450661649. The reversal of 381450661633 is 336166054183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215534562049 + 165916099584 = 464257^2 + 407328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381450661633 is a prime.

It is not a weakly prime, because it can be changed into another prime (381450661673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190725330816 + 190725330817.

It is an arithmetic number, because the mean of its divisors is an integer number (190725330817).

Almost surely, 2^381450661633 is an apocalyptic number.

It is an amenable number.

381450661633 is a deficient number, since it is larger than the sum of its proper divisors (1).

381450661633 is an equidigital number, since it uses as much as digits as its factorization.

381450661633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 381450661633 in words is "three hundred eighty-one billion, four hundred fifty million, six hundred sixty-one thousand, six hundred thirty-three".