1664565107 has 2 divisors, whose sum is σ = 1664565108. Its totient is φ = 1664565106.

The previous prime is 1664565073. The next prime is 1664565121. The reversal of 1664565107 is 7015654661.

It is a strong prime.

It is an emirp because it is prime and its reverse (7015654661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1664565107 - 2¹² = 1664561011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1664565127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832282553 + 832282554.

It is an arithmetic number, because the mean of its divisors is an integer number (832282554).

Almost surely, 2^1664565107 is an apocalyptic number.

1664565107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664565107 is an equidigital number, since it uses as much as digits as its factorization.

1664565107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 1664565107 is about 40799.0821833041. The cubic root of 1664565107 is about 1185.1325569932.

The spelling of 1664565107 in words is "one billion, six hundred sixty-four million, five hundred sixty-five thousand, one hundred seven".