1395801665 has 4 divisors (see below), whose sum is σ = 1674962004. Its totient is φ = 1116641328.

The previous prime is 1395801647. The next prime is 1395801679. The reversal of 1395801665 is 5661085931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5661085931 = 59 ⋅95950609.

It can be written as a sum of positive squares in 2 ways, for example, as 287777296 + 1108024369 = 16964^2 + 33287^2 .

It is a cyclic number.

It is not a de Polignac number, because 1395801665 - 2¹⁰ = 1395800641 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, 139580162 + ... + 139580171.

It is an arithmetic number, because the mean of its divisors is an integer number (418740501).

Almost surely, 2^1395801665 is an apocalyptic number.

It is an amenable number.

1395801665 is a deficient number, since it is larger than the sum of its proper divisors (279160339).

1395801665 is an equidigital number, since it uses as much as digits as its factorization.

1395801665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279160338.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 1395801665 is about 37360.4291329744. The cubic root of 1395801665 is about 1117.5695769514.

The spelling of 1395801665 in words is "one billion, three hundred ninety-five million, eight hundred one thousand, six hundred sixty-five".