2113661213646 has 32 divisors (see below), whose sum is σ = 4478155877760. Its totient is φ = 663220542816.

The previous prime is 2113661213597. The next prime is 2113661213659. The reversal of 2113661213646 is 6463121663112.

It is a happy number.

It is a super-2 number, since 2×2113661213646² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2113661213598 and 2113661213607.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 59029516 + ... + 59065311.

It is an arithmetic number, because the mean of its divisors is an integer number (139942371180).

Almost surely, 2^{2113661213646} is an apocalyptic number.

2113661213646 is an abundant number, since it is smaller than the sum of its proper divisors (2364494664114).

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

2113661213646 is a wasteful number, since it uses less digits than its factorization.

2113661213646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118095008.

The product of its digits is 186624, while the sum is 42.

Adding to 2113661213646 its reverse (6463121663112), we get a palindrome (8576782876758).

The spelling of 2113661213646 in words is "two trillion, one hundred thirteen billion, six hundred sixty-one million, two hundred thirteen thousand, six hundred forty-six".