1665810103 has 2 divisors, whose sum is σ = 1665810104. Its totient is φ = 1665810102.

The previous prime is 1665810073. The next prime is 1665810149. The reversal of 1665810103 is 3010185661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1665810103 - 2²⁵ = 1632255671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665810173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832905051 + 832905052.

It is an arithmetic number, because the mean of its divisors is an integer number (832905052).

Almost surely, 2^1665810103 is an apocalyptic number.

1665810103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665810103 is an equidigital number, since it uses as much as digits as its factorization.

1665810103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1665810103 is about 40814.3369785667. The cubic root of 1665810103 is about 1185.4279529861.

Adding to 1665810103 its reverse (3010185661), we get a palindrome (4675995764).

The spelling of 1665810103 in words is "one billion, six hundred sixty-five million, eight hundred ten thousand, one hundred three".