2116646662561 has 8 divisors (see below), whose sum is σ = 2130292287680. Its totient is φ = 2103009087312.

The previous prime is 2116646662547. The next prime is 2116646662649. The reversal of 2116646662561 is 1652666466112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2116646662561 - 2¹⁵ = 2116646629793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2116646662499 and 2116646662508.

It is not an unprimeable number, because it can be changed into a prime (2116646662661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1484445 + ... + 2537098.

It is an arithmetic number, because the mean of its divisors is an integer number (266286535960).

Almost surely, 2^{2116646662561} is an apocalyptic number.

It is an amenable number.

2116646662561 is a deficient number, since it is larger than the sum of its proper divisors (13645625119).

2116646662561 is a wasteful number, since it uses less digits than its factorization.

2116646662561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024935.

The product of its digits is 3732480, while the sum is 52.

The spelling of 2116646662561 in words is "two trillion, one hundred sixteen billion, six hundred forty-six million, six hundred sixty-two thousand, five hundred sixty-one".