1656665510011 has 4 divisors (see below), whose sum is σ = 1656865333224. Its totient is φ = 1656465686800.

The previous prime is 1656665509987. The next prime is 1656665510021. The reversal of 1656665510011 is 1100155666561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1656665510011 - 2¹¹ = 1656665507963 is a prime.

It is a super-2 number, since 2×1656665510011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1656665510011.

It is not an unprimeable number, because it can be changed into a prime (1656665510021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99899170 + ... + 99915751.

It is an arithmetic number, because the mean of its divisors is an integer number (414216333306).

Almost surely, 2^{1656665510011} is an apocalyptic number.

1656665510011 is a deficient number, since it is larger than the sum of its proper divisors (199823213).

1656665510011 is an equidigital number, since it uses as much as digits as its factorization.

1656665510011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199823212.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 1656665510011 in words is "one trillion, six hundred fifty-six billion, six hundred sixty-five million, five hundred ten thousand, eleven".