2516321321646 has 64 divisors (see below), whose sum is σ = 5505464401920. Its totient is φ = 760397833440.

The previous prime is 2516321321639. The next prime is 2516321321677. The reversal of 2516321321646 is 6461231236152.

It is a junction number, because it is equal to n+sod(n) for n = 2516321321598 and 2516321321607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42430611 + ... + 42489873.

It is an arithmetic number, because the mean of its divisors is an integer number (86022881280).

Almost surely, 2^{2516321321646} is an apocalyptic number.

2516321321646 is an abundant number, since it is smaller than the sum of its proper divisors (2989143080274).

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

2516321321646 is a wasteful number, since it uses less digits than its factorization.

2516321321646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61061.

The product of its digits is 311040, while the sum is 42.

Adding to 2516321321646 its reverse (6461231236152), we get a palindrome (8977552557798).

The spelling of 2516321321646 in words is "two trillion, five hundred sixteen billion, three hundred twenty-one million, three hundred twenty-one thousand, six hundred forty-six".