2211665323225 has 12 divisors (see below), whose sum is σ = 2742542511804. Its totient is φ = 1769282251520.

The previous prime is 2211665323223. The next prime is 2211665323229. The reversal of 2211665323225 is 5223235661122.

It can be written as a sum of positive squares in 6 ways, for example, as 182530599696 + 2029134723529 = 427236^2 + 1424477^2 .

It is not a de Polignac number, because 2211665323225 - 2¹ = 2211665323223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2211665323223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 334804 + ... + 2129653.

It is an arithmetic number, because the mean of its divisors is an integer number (228545209317).

Almost surely, 2^{2211665323225} is an apocalyptic number.

2211665323225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2211665323225 is a deficient number, since it is larger than the sum of its proper divisors (530877188579).

2211665323225 is a wasteful number, since it uses less digits than its factorization.

2211665323225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500364 (or 2500359 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The spelling of 2211665323225 in words is "two trillion, two hundred eleven billion, six hundred sixty-five million, three hundred twenty-three thousand, two hundred twenty-five".