1011660565061 has 4 divisors (see below), whose sum is σ = 1011679380192. Its totient is φ = 1011641749932.

The previous prime is 1011660565009. The next prime is 1011660565093. The reversal of 1011660565061 is 1605650661101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1011660565061 - 2⁶ = 1011660564997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011660565961) 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, 9326681 + ... + 9434526.

It is an arithmetic number, because the mean of its divisors is an integer number (252919845048).

Almost surely, 2^{1011660565061} is an apocalyptic number.

It is an amenable number.

1011660565061 is a deficient number, since it is larger than the sum of its proper divisors (18815131).

1011660565061 is an equidigital number, since it uses as much as digits as its factorization.

1011660565061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18815130.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 1011660565061 in words is "one trillion, eleven billion, six hundred sixty million, five hundred sixty-five thousand, sixty-one".