55330121540 has 48 divisors (see below), whose sum is σ = 123242454720. Its totient is φ = 20807130240.

The previous prime is 55330121533. The next prime is 55330121543. The reversal of 55330121540 is 4512103355.

It is a super-2 number, since 2×55330121540² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55330121543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505967 + ... + 605526.

It is an arithmetic number, because the mean of its divisors is an integer number (2567551140).

Almost surely, 2^55330121540 is an apocalyptic number.

It is an amenable number.

55330121540 is an abundant number, since it is smaller than the sum of its proper divisors (67912333180).

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

55330121540 is a wasteful number, since it uses less digits than its factorization.

55330121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111652 (or 1111650 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 55330121540 its reverse (4512103355), we get a palindrome (59842224895).

The spelling of 55330121540 in words is "fifty-five billion, three hundred thirty million, one hundred twenty-one thousand, five hundred forty".