55131551040 has 224 divisors, whose sum is σ = 180101687040. Its totient is φ = 14278311936.

The previous prime is 55131551017. The next prime is 55131551047. The reversal of 55131551040 is 4015513155.

It is a super-2 number, since 2×55131551040² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55131550989 and 55131551007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55131551047) 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, 26390316 + ... + 26392404.

Almost surely, 2^55131551040 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 55131551040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90050843520).

55131551040 is an abundant number, since it is smaller than the sum of its proper divisors (124970136000).

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

55131551040 is a wasteful number, since it uses less digits than its factorization.

55131551040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889 (or 2879 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 55131551040 in words is "fifty-five billion, one hundred thirty-one million, five hundred fifty-one thousand, forty".