1225220231555 has 16 divisors (see below), whose sum is σ = 1580575265280. Its totient is φ = 908830770912.

The previous prime is 1225220231399. The next prime is 1225220231611. The reversal of 1225220231555 is 5551320225221.

It is a cyclic number.

It is not a de Polignac number, because 1225220231555 - 2⁸ = 1225220231299 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137198249 + ... + 137207178.

It is an arithmetic number, because the mean of its divisors is an integer number (98785954080).

Almost surely, 2^{1225220231555} is an apocalyptic number.

1225220231555 is a deficient number, since it is larger than the sum of its proper divisors (355355033725).

1225220231555 is a wasteful number, since it uses less digits than its factorization.

1225220231555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274405498.

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 1225220231555 its reverse (5551320225221), we get a palindrome (6776540456776).

The spelling of 1225220231555 in words is "one trillion, two hundred twenty-five billion, two hundred twenty million, two hundred thirty-one thousand, five hundred fifty-five".