1665437465 has 8 divisors (see below), whose sum is σ = 1998790728. Its totient is φ = 1332172800.

The previous prime is 1665437461. The next prime is 1665437471. The reversal of 1665437465 is 5647345661.

It can be written as a sum of positive squares in 4 ways, for example, as 444703744 + 1220733721 = 21088^2 + 34939^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1665437465 - 2² = 1665437461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665437461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30659 + ... + 65351.

It is an arithmetic number, because the mean of its divisors is an integer number (249848841).

Almost surely, 2^1665437465 is an apocalyptic number.

It is an amenable number.

1665437465 is a deficient number, since it is larger than the sum of its proper divisors (333353263).

1665437465 is an equidigital number, since it uses as much as digits as its factorization.

1665437465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44299.

The product of its digits is 1814400, while the sum is 47.

The square root of 1665437465 is about 40809.7716852226. The cubic root of 1665437465 is about 1185.3395538656.

The spelling of 1665437465 in words is "one billion, six hundred sixty-five million, four hundred thirty-seven thousand, four hundred sixty-five".