515655515616 has 48 divisors (see below), whose sum is σ = 1353636993744. Its totient is φ = 171879931904.

The previous prime is 515655515597. The next prime is 515655515659. The reversal of 515655515616 is 616515556515.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×515655515616² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4297006 + ... + 4415378.

It is an arithmetic number, because the mean of its divisors is an integer number (28200770703).

Almost surely, 2^515655515616 is an apocalyptic number.

It is an amenable number.

515655515616 is an abundant number, since it is smaller than the sum of its proper divisors (837981478128).

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

515655515616 is a wasteful number, since it uses less digits than its factorization.

515655515616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163763 (or 163755 counting only the distinct ones).

The product of its digits is 3375000, while the sum is 51.

The spelling of 515655515616 in words is "five hundred fifteen billion, six hundred fifty-five million, five hundred fifteen thousand, six hundred sixteen".