1213555551325 has 48 divisors (see below), whose sum is σ = 1643341208320. Its totient is φ = 883599425280.

The previous prime is 1213555551283. The next prime is 1213555551331. The reversal of 1213555551325 is 5231555553121.

It is not a de Polignac number, because 1213555551325 - 2⁹ = 1213555550813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18787534 + ... + 18852016.

Almost surely, 2^{1213555551325} is an apocalyptic number.

It is an amenable number.

1213555551325 is a deficient number, since it is larger than the sum of its proper divisors (429785656995).

1213555551325 is a wasteful number, since it uses less digits than its factorization.

1213555551325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65318 (or 65313 counting only the distinct ones).

The product of its digits is 562500, while the sum is 43.

The spelling of 1213555551325 in words is "one trillion, two hundred thirteen billion, five hundred fifty-five million, five hundred fifty-one thousand, three hundred twenty-five".