1660643363 has 2 divisors, whose sum is σ = 1660643364. Its totient is φ = 1660643362.

The previous prime is 1660643357. The next prime is 1660643381. The reversal of 1660643363 is 3633460661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1660643363 - 2⁸ = 1660643107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1660643863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830321681 + 830321682.

It is an arithmetic number, because the mean of its divisors is an integer number (830321682).

Almost surely, 2^1660643363 is an apocalyptic number.

1660643363 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660643363 is an equidigital number, since it uses as much as digits as its factorization.

1660643363 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 38.

The square root of 1660643363 is about 40750.9921719705. The cubic root of 1660643363 is about 1184.2010942049.

The spelling of 1660643363 in words is "one billion, six hundred sixty million, six hundred forty-three thousand, three hundred sixty-three".