2116660661651 has 8 divisors (see below), whose sum is σ = 2123652171264. Its totient is φ = 2109674277000.

The previous prime is 2116660661629. The next prime is 2116660661657. The reversal of 2116660661651 is 1561660666112.

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 2116660661651 - 2³⁴ = 2099480792467 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2116660661596 and 2116660661605.

It is not an unprimeable number, because it can be changed into a prime (2116660661657) 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, 452975 + ... + 2106776.

It is an arithmetic number, because the mean of its divisors is an integer number (265456521408).

Almost surely, 2^{2116660661651} is an apocalyptic number.

2116660661651 is a deficient number, since it is larger than the sum of its proper divisors (6991509613).

2116660661651 is a wasteful number, since it uses less digits than its factorization.

2116660661651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562481.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 2116660661651 in words is "two trillion, one hundred sixteen billion, six hundred sixty million, six hundred sixty-one thousand, six hundred fifty-one".