55015257321 has 16 divisors (see below), whose sum is σ = 85793774400. Its totient is φ = 34746477984.

The previous prime is 55015257317. The next prime is 55015257337. The reversal of 55015257321 is 12375251055.

55015257321 is a `hidden beast` number, since 5 + 50 + 15 + 2 + 573 + 21 = 666.

It is not a de Polignac number, because 55015257321 - 2² = 55015257317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55015257301) 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, 53620596 + ... + 53621621.

It is an arithmetic number, because the mean of its divisors is an integer number (5362110900).

Almost surely, 2^55015257321 is an apocalyptic number.

It is an amenable number.

55015257321 is a deficient number, since it is larger than the sum of its proper divisors (30778517079).

55015257321 is a wasteful number, since it uses less digits than its factorization.

55015257321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107242245 (or 107242239 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 36.

The spelling of 55015257321 in words is "fifty-five billion, fifteen million, two hundred fifty-seven thousand, three hundred twenty-one".