51556522565515 has 16 divisors (see below), whose sum is σ = 67525275767040. Its totient is φ = 37477263457120.

The previous prime is 51556522565501. The next prime is 51556522565531.

51556522565515 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-51556522565515 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51556522565515.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229753309 + ... + 229977598.

It is an arithmetic number, because the mean of its divisors is an integer number (4220329735440).

Almost surely, 2^{51556522565515} is an apocalyptic number.

51556522565515 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51556522565515 is a deficient number, since it is larger than the sum of its proper divisors (15968753201525).

51556522565515 is a wasteful number, since it uses less digits than its factorization.

51556522565515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459732962.

The product of its digits is 56250000, while the sum is 58.

The spelling of 51556522565515 in words is "fifty-one trillion, five hundred fifty-six billion, five hundred twenty-two million, five hundred sixty-five thousand, five hundred fifteen".