1610066665 has 4 divisors (see below), whose sum is σ = 1932080004. Its totient is φ = 1288053328.

The previous prime is 1610066659. The next prime is 1610066671. The reversal of 1610066665 is 5666600161.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1610066659) and next prime (1610066671).

It can be written as a sum of positive squares in 2 ways, for example, as 1265296041 + 344770624 = 35571^2 + 18568^2 .

It is a cyclic number.

It is not a de Polignac number, because 1610066665 - 2³ = 1610066657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161006662 + ... + 161006671.

It is an arithmetic number, because the mean of its divisors is an integer number (483020001).

Almost surely, 2^1610066665 is an apocalyptic number.

It is an amenable number.

1610066665 is a deficient number, since it is larger than the sum of its proper divisors (322013339).

1610066665 is an equidigital number, since it uses as much as digits as its factorization.

1610066665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322013338.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1610066665 is about 40125.6360074205. The cubic root of 1610066665 is about 1172.0548944476.

The spelling of 1610066665 in words is "one billion, six hundred ten million, sixty-six thousand, six hundred sixty-five".