1225016665 has 8 divisors (see below), whose sum is σ = 1483507080. Its totient is φ = 971021952.

The previous prime is 1225016657. The next prime is 1225016707. The reversal of 1225016665 is 5666105221.

It can be written as a sum of positive squares in 4 ways, for example, as 279023616 + 945993049 = 16704^2 + 30757^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225016665 - 2³ = 1225016657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1225016665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1123324 + ... + 1124413.

It is an arithmetic number, because the mean of its divisors is an integer number (185438385).

Almost surely, 2^1225016665 is an apocalyptic number.

It is an amenable number.

1225016665 is a deficient number, since it is larger than the sum of its proper divisors (258490415).

1225016665 is a wasteful number, since it uses less digits than its factorization.

1225016665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247851.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1225016665 is about 35000.2380706189. The cubic root of 1225016665 is about 1069.9923326088.

The spelling of 1225016665 in words is "one billion, two hundred twenty-five million, sixteen thousand, six hundred sixty-five".