1223866501225 has 27 divisors (see below), whose sum is σ = 1534073601231. Its totient is φ = 968574643200.

The previous prime is 1223866501213. The next prime is 1223866501241. The reversal of 1223866501225 is 5221056683221.

The square root of 1223866501225 is 1106285.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 722426901849 + 501439599376 = 849957^2 + 708124^2 .

It is not a de Polignac number, because 1223866501225 - 2⁷ = 1223866501097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 536547085 + ... + 536549365.

Almost surely, 2^{1223866501225} is an apocalyptic number.

1223866501225 is the 1106285-th square number.

1223866501225 is the 553143-rd centered octagonal number.

It is an amenable number.

1223866501225 is a deficient number, since it is larger than the sum of its proper divisors (310207100006).

1223866501225 is an frugal number, since it uses more digits than its factorization.

1223866501225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766 (or 2383 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 1223866501225 in words is "one trillion, two hundred twenty-three billion, eight hundred sixty-six million, five hundred one thousand, two hundred twenty-five".