1661050771 has 2 divisors, whose sum is σ = 1661050772. Its totient is φ = 1661050770.

The previous prime is 1661050763. The next prime is 1661050799. The reversal of 1661050771 is 1770501661.

It is a weak prime.

It is an emirp because it is prime and its reverse (1770501661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1661050771 - 2³ = 1661050763 is a prime.

It is not a weakly prime, because it can be changed into another prime (1661000771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830525385 + 830525386.

It is an arithmetic number, because the mean of its divisors is an integer number (830525386).

Almost surely, 2^1661050771 is an apocalyptic number.

1661050771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661050771 is an equidigital number, since it uses as much as digits as its factorization.

1661050771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 1661050771 is about 40755.9906148777. The cubic root of 1661050771 is about 1184.2979268666.

The spelling of 1661050771 in words is "one billion, six hundred sixty-one million, fifty thousand, seven hundred seventy-one".