10420203665 has 4 divisors (see below), whose sum is σ = 12504244404. Its totient is φ = 8336162928.

The previous prime is 10420203641. The next prime is 10420203679. The reversal of 10420203665 is 56630202401.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3833095744 + 6587107921 = 61912^2 + 81161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10420203665 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, 1042020362 + ... + 1042020371.

It is an arithmetic number, because the mean of its divisors is an integer number (3126061101).

Almost surely, 2^10420203665 is an apocalyptic number.

It is an amenable number.

10420203665 is a deficient number, since it is larger than the sum of its proper divisors (2084040739).

10420203665 is an equidigital number, since it uses as much as digits as its factorization.

10420203665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084040738.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 10420203665 in words is "ten billion, four hundred twenty million, two hundred three thousand, six hundred sixty-five".