155621561116 has 24 divisors (see below), whose sum is σ = 311252848256. Its totient is φ = 66692870640.

The previous prime is 155621561093. The next prime is 155621561119. The reversal of 155621561116 is 611165126551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155621561119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1118911 + ... + 1250281.

Almost surely, 2^155621561116 is an apocalyptic number.

It is an amenable number.

155621561116 is an abundant number, since it is smaller than the sum of its proper divisors (155631287140).

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

155621561116 is a wasteful number, since it uses less digits than its factorization.

155621561116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173689 (or 173687 counting only the distinct ones).

The product of its digits is 54000, while the sum is 40.

Adding to 155621561116 its reverse (611165126551), we get a palindrome (766786687667).

The spelling of 155621561116 in words is "one hundred fifty-five billion, six hundred twenty-one million, five hundred sixty-one thousand, one hundred sixteen".