1561118832 has 600 divisors, whose sum is σ = 5938703232. Its totient is φ = 391910400.

The previous prime is 1561118821. The next prime is 1561118833. The reversal of 1561118832 is 2388111651.

1561118832 is a `hidden beast` number, since 1 + 5 + 611 + 1 + 8 + 8 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561118833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 25592082 + ... + 25592142.

Almost surely, 2^1561118832 is an apocalyptic number.

1561118832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561118832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2969351616).

1561118832 is an abundant number, since it is smaller than the sum of its proper divisors (4377584400).

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

1561118832 is a wasteful number, since it uses less digits than its factorization.

1561118832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 117 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 1561118832 is about 39510.9963427904. The cubic root of 1561118832 is about 1160.0551975320.

It can be divided in two parts, 15611 and 18832, that added together give a palindrome (34443).

The spelling of 1561118832 in words is "one billion, five hundred sixty-one million, one hundred eighteen thousand, eight hundred thirty-two".