15551254422 has 64 divisors (see below), whose sum is σ = 37975392000. Its totient is φ = 4678079040.

The previous prime is 15551254409. The next prime is 15551254427. The reversal of 15551254422 is 22445215551.

15551254422 is a `hidden beast` number, since 1 + 55 + 512 + 54 + 42 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15551254427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14172 + ... + 176927.

It is an arithmetic number, because the mean of its divisors is an integer number (593365500).

Almost surely, 2^15551254422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15551254422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18987696000).

15551254422 is an abundant number, since it is smaller than the sum of its proper divisors (22424137578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15551254422 is a wasteful number, since it uses less digits than its factorization.

15551254422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191258 (or 191252 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

Adding to 15551254422 its reverse (22445215551), we get a palindrome (37996469973).

The spelling of 15551254422 in words is "fifteen billion, five hundred fifty-one million, two hundred fifty-four thousand, four hundred twenty-two".