1650663397 has 2 divisors, whose sum is σ = 1650663398. Its totient is φ = 1650663396.

The previous prime is 1650663353. The next prime is 1650663401. The reversal of 1650663397 is 7933660561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1649090881 + 1572516 = 40609^2 + 1254^2 .

It is an emirp because it is prime and its reverse (7933660561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1650663397 - 2¹⁹ = 1650139109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1650663307) 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, 825331698 + 825331699.

It is an arithmetic number, because the mean of its divisors is an integer number (825331699).

Almost surely, 2^1650663397 is an apocalyptic number.

It is an amenable number.

1650663397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1650663397 is an equidigital number, since it uses as much as digits as its factorization.

1650663397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 46.

The square root of 1650663397 is about 40628.3570551407. The cubic root of 1650663397 is about 1181.8240956145.

The spelling of 1650663397 in words is "one billion, six hundred fifty million, six hundred sixty-three thousand, three hundred ninety-seven".