1650561553 has 2 divisors, whose sum is σ = 1650561554. Its totient is φ = 1650561552.

The previous prime is 1650561547. The next prime is 1650561571. The reversal of 1650561553 is 3551650561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1032144129 + 618417424 = 32127^2 + 24868^2 .

It is a cyclic number.

It is not a de Polignac number, because 1650561553 - 2¹³ = 1650553361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1650561503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825280776 + 825280777.

It is an arithmetic number, because the mean of its divisors is an integer number (825280777).

Almost surely, 2^1650561553 is an apocalyptic number.

It is an amenable number.

1650561553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1650561553 is an equidigital number, since it uses as much as digits as its factorization.

1650561553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67500, while the sum is 37.

The square root of 1650561553 is about 40627.1036747637. The cubic root of 1650561553 is about 1181.7997893933.

The spelling of 1650561553 in words is "one billion, six hundred fifty million, five hundred sixty-one thousand, five hundred fifty-three".