1662975641 has 2 divisors, whose sum is σ = 1662975642. Its totient is φ = 1662975640.

The previous prime is 1662975631. The next prime is 1662975661. The reversal of 1662975641 is 1465792661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1169913616 + 493062025 = 34204^2 + 22205^2 .

It is an emirp because it is prime and its reverse (1465792661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1662975641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1662975631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831487820 + 831487821.

It is an arithmetic number, because the mean of its divisors is an integer number (831487821).

Almost surely, 2^1662975641 is an apocalyptic number.

It is an amenable number.

1662975641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662975641 is an equidigital number, since it uses as much as digits as its factorization.

1662975641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The square root of 1662975641 is about 40779.5983427988. The cubic root of 1662975641 is about 1184.7552156293.

The spelling of 1662975641 in words is "one billion, six hundred sixty-two million, nine hundred seventy-five thousand, six hundred forty-one".