15551311233 has 16 divisors (see below), whose sum is σ = 21389336640. Its totient is φ = 10042883136.

The previous prime is 15551311207. The next prime is 15551311247. The reversal of 15551311233 is 33211315551.

It is not a de Polignac number, because 15551311233 - 2⁵ = 15551311201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15551311233.

It is not an unprimeable number, because it can be changed into a prime (15551311283) 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 15 ways as a sum of consecutive naturals, for example, 283398 + ... + 333791.

It is an arithmetic number, because the mean of its divisors is an integer number (1336833540).

Almost surely, 2^15551311233 is an apocalyptic number.

It is an amenable number.

15551311233 is a deficient number, since it is larger than the sum of its proper divisors (5838025407).

15551311233 is a wasteful number, since it uses less digits than its factorization.

15551311233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617456.

The product of its digits is 6750, while the sum is 30.

Adding to 15551311233 its reverse (33211315551), we get a palindrome (48762626784).

The spelling of 15551311233 in words is "fifteen billion, five hundred fifty-one million, three hundred eleven thousand, two hundred thirty-three".