15555551143 has 4 divisors (see below), whose sum is σ = 16969692168. Its totient is φ = 14141410120.

The previous prime is 15555551117. The next prime is 15555551149. The reversal of 15555551143 is 34115555551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15555551143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15555551096 and 15555551105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15555551149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707070496 + ... + 707070517.

It is an arithmetic number, because the mean of its divisors is an integer number (4242423042).

Almost surely, 2^15555551143 is an apocalyptic number.

15555551143 is a deficient number, since it is larger than the sum of its proper divisors (1414141025).

15555551143 is a wasteful number, since it uses less digits than its factorization.

15555551143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414141024.

The product of its digits is 187500, while the sum is 40.

The spelling of 15555551143 in words is "fifteen billion, five hundred fifty-five million, five hundred fifty-one thousand, one hundred forty-three".