1225243234665 has 24 divisors (see below), whose sum is σ = 2235531517440. Its totient is φ = 619070265504.

The previous prime is 1225243234651. The next prime is 1225243234669. The reversal of 1225243234665 is 5664323425221.

1225243234665 is a `hidden beast` number, since 1 + 2 + 2 + 5 + 243 + 2 + 346 + 65 = 666.

It is not a de Polignac number, because 1225243234665 - 2¹² = 1225243230569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1225243234665.

It is not an unprimeable number, because it can be changed into a prime (1225243234669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 716515657 + ... + 716517366.

It is an arithmetic number, because the mean of its divisors is an integer number (93147146560).

Almost surely, 2^{1225243234665} is an apocalyptic number.

1225243234665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1225243234665 is a deficient number, since it is larger than the sum of its proper divisors (1010288282775).

1225243234665 is a wasteful number, since it uses less digits than its factorization.

1225243234665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433033053 (or 1433033050 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 45.

Adding to 1225243234665 its reverse (5664323425221), we get a palindrome (6889566659886).

The spelling of 1225243234665 in words is "one trillion, two hundred twenty-five billion, two hundred forty-three million, two hundred thirty-four thousand, six hundred sixty-five".