1025223635665 has 4 divisors (see below), whose sum is σ = 1230268362804. Its totient is φ = 820178908528.

The previous prime is 1025223635641. The next prime is 1025223635701. The reversal of 1025223635665 is 5665363225201.

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 728194275649 + 297029360016 = 853343^2 + 545004^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025223635665 - 2¹³ = 1025223627473 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, 102522363562 + ... + 102522363571.

It is an arithmetic number, because the mean of its divisors is an integer number (307567090701).

Almost surely, 2^{1025223635665} is an apocalyptic number.

It is an amenable number.

1025223635665 is a deficient number, since it is larger than the sum of its proper divisors (205044727139).

1025223635665 is an equidigital number, since it uses as much as digits as its factorization.

1025223635665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205044727138.

The product of its (nonzero) digits is 1944000, while the sum is 46.

The spelling of 1025223635665 in words is "one trillion, twenty-five billion, two hundred twenty-three million, six hundred thirty-five thousand, six hundred sixty-five".