1065561650561 has 4 divisors (see below), whose sum is σ = 1079049772800. Its totient is φ = 1052073528324.

The previous prime is 1065561650537. The next prime is 1065561650609. The reversal of 1065561650561 is 1650561655601.

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 1065561650561 - 2⁶ = 1065561650497 is a prime.

It is a super-2 number, since 2×1065561650561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1065561650161) 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, 6744061001 + ... + 6744061158.

It is an arithmetic number, because the mean of its divisors is an integer number (269762443200).

Almost surely, 2^{1065561650561} is an apocalyptic number.

It is an amenable number.

1065561650561 is a deficient number, since it is larger than the sum of its proper divisors (13488122239).

1065561650561 is an equidigital number, since it uses as much as digits as its factorization.

1065561650561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13488122238.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 1065561650561 in words is "one trillion, sixty-five billion, five hundred sixty-one million, six hundred fifty thousand, five hundred sixty-one".