515506005551 has 12 divisors (see below), whose sum is σ = 555550900920. Its totient is φ = 477016540560.

The previous prime is 515506005541. The next prime is 515506005559. The reversal of 515506005551 is 155500605515.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-515506005551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515506005559) 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 11 ways as a sum of consecutive naturals, for example, 7301780 + ... + 7372041.

It is an arithmetic number, because the mean of its divisors is an integer number (46295908410).

Almost surely, 2^515506005551 is an apocalyptic number.

515506005551 is a deficient number, since it is larger than the sum of its proper divisors (40044895369).

515506005551 is a wasteful number, since it uses less digits than its factorization.

515506005551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14673926 (or 14673883 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 38.

The spelling of 515506005551 in words is "five hundred fifteen billion, five hundred six million, five thousand, five hundred fifty-one".