55515012 has 24 divisors (see below), whose sum is σ = 148040256. Its totient is φ = 15861408.

The previous prime is 55515011. The next prime is 55515023. The reversal of 55515012 is 21051555.

55515012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (55515011) 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 7 ways as a sum of consecutive naturals, for example, 330363 + ... + 330530.

It is an arithmetic number, because the mean of its divisors is an integer number (6168344).

Almost surely, 2^55515012 is an apocalyptic number.

It is an amenable number.

55515012 is an abundant number, since it is smaller than the sum of its proper divisors (92525244).

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

55515012 is a wasteful number, since it uses less digits than its factorization.

55515012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660907 (or 660905 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 55515012 is about 7450.8396842235. The cubic root of 55515012 is about 381.4785700244.

Adding to 55515012 its reverse (21051555), we get a palindrome (76566567).

The spelling of 55515012 in words is "fifty-five million, five hundred fifteen thousand, twelve".