55131101520 has 320 divisors, whose sum is σ = 194857242624. Its totient is φ = 12775311360.

The previous prime is 55131101497. The next prime is 55131101521. The reversal of 55131101520 is 2510113155.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55131101521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5330274 + ... + 5340606.

Almost surely, 2^55131101520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55131101520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97428621312).

55131101520 is an abundant number, since it is smaller than the sum of its proper divisors (139726141104).

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

55131101520 is a wasteful number, since it uses less digits than its factorization.

55131101520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10450 (or 10444 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 24.

Adding to 55131101520 its reverse (2510113155), we get a palindrome (57641214675).

It can be divided in two parts, 55131 and 101520, that added together give a palindrome (156651).

The spelling of 55131101520 in words is "fifty-five billion, one hundred thirty-one million, one hundred one thousand, five hundred twenty".