15565511142 has 48 divisors (see below), whose sum is σ = 35271445248. Its totient is φ = 4951655280.

The previous prime is 15565511123. The next prime is 15565511149. The reversal of 15565511142 is 24111556551.

15565511142 is a `hidden beast` number, since 1 + 5 + 56 + 551 + 11 + 42 = 666.

It is a super-2 number, since 2×15565511142² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15565511097 and 15565511106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15565511149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140967 + ... + 225837.

It is an arithmetic number, because the mean of its divisors is an integer number (734821776).

Almost surely, 2^15565511142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15565511142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17635722624).

15565511142 is an abundant number, since it is smaller than the sum of its proper divisors (19705934106).

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

15565511142 is a wasteful number, since it uses less digits than its factorization.

15565511142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85345 (or 85342 counting only the distinct ones).

The product of its digits is 30000, while the sum is 36.

The spelling of 15565511142 in words is "fifteen billion, five hundred sixty-five million, five hundred eleven thousand, one hundred forty-two".