15555253543 has 4 divisors (see below), whose sum is σ = 15692910768. Its totient is φ = 15417596320.

The previous prime is 15555253531. The next prime is 15555253547. The reversal of 15555253543 is 34535255551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34535255551 = 19 ⋅1817645029.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15555253543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15555253543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15555253547) 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 3 ways as a sum of consecutive naturals, for example, 68828443 + ... + 68828668.

It is an arithmetic number, because the mean of its divisors is an integer number (3923227692).

Almost surely, 2^15555253543 is an apocalyptic number.

15555253543 is a deficient number, since it is larger than the sum of its proper divisors (137657225).

15555253543 is a wasteful number, since it uses less digits than its factorization.

15555253543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137657224.

The product of its digits is 1125000, while the sum is 43.

The spelling of 15555253543 in words is "fifteen billion, five hundred fifty-five million, two hundred fifty-three thousand, five hundred forty-three".