1660297399 has 2 divisors, whose sum is σ = 1660297400. Its totient is φ = 1660297398.

The previous prime is 1660297393. The next prime is 1660297423. The reversal of 1660297399 is 9937920661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1660297399 - 2⁹ = 1660296887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660297393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830148699 + 830148700.

It is an arithmetic number, because the mean of its divisors is an integer number (830148700).

Almost surely, 2^1660297399 is an apocalyptic number.

1660297399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660297399 is an equidigital number, since it uses as much as digits as its factorization.

1660297399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 52.

The square root of 1660297399 is about 40746.7470971610. The cubic root of 1660297399 is about 1184.1188531068.

The spelling of 1660297399 in words is "one billion, six hundred sixty million, two hundred ninety-seven thousand, three hundred ninety-nine".