515556225020361 has 16 divisors (see below), whose sum is σ = 788529967113600. Its totient is φ = 293508376641408.

The previous prime is 515556225020357. The next prime is 515556225020363. The reversal of 515556225020361 is 163020522655515.

It is not a de Polignac number, because 515556225020361 - 2² = 515556225020357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 515556225020361.

It is not an unprimeable number, because it can be changed into a prime (515556225020363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45632515596 + ... + 45632526893.

It is an arithmetic number, because the mean of its divisors is an integer number (49283122944600).

Almost surely, 2^{515556225020361} is an apocalyptic number.

It is an amenable number.

515556225020361 is a deficient number, since it is larger than the sum of its proper divisors (272973742093239).

515556225020361 is a wasteful number, since it uses less digits than its factorization.

515556225020361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91265042768.

The product of its (nonzero) digits is 2700000, while the sum is 48.

Adding to 515556225020361 its reverse (163020522655515), we get a palindrome (678576747675876).

The spelling of 515556225020361 in words is "five hundred fifteen trillion, five hundred fifty-six billion, two hundred twenty-five million, twenty thousand, three hundred sixty-one".