55513231533 has 12 divisors (see below), whose sum is σ = 82352962588. Its totient is φ = 36008582400.

The previous prime is 55513231531. The next prime is 55513231601. The reversal of 55513231533 is 33513231555.

55513231533 is a `hidden beast` number, since 55 + 51 + 3 + 23 + 1 + 533 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34983213444 + 20530018089 = 187038^2 + 143283^2 .

It is not a de Polignac number, because 55513231533 - 2¹ = 55513231531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55513231531) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 83352868 + ... + 83353533.

Almost surely, 2^55513231533 is an apocalyptic number.

It is an amenable number.

55513231533 is a deficient number, since it is larger than the sum of its proper divisors (26839731055).

55513231533 is a wasteful number, since it uses less digits than its factorization.

55513231533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166706444 (or 166706441 counting only the distinct ones).

The product of its digits is 101250, while the sum is 36.

The spelling of 55513231533 in words is "fifty-five billion, five hundred thirteen million, two hundred thirty-one thousand, five hundred thirty-three".