1065561606505 has 32 divisors (see below), whose sum is σ = 1406238185088. Its totient is φ = 768688166400.

The previous prime is 1065561606503. The next prime is 1065561606539. The reversal of 1065561606505 is 5056061655601.

1065561606505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1065561606505 - 2¹ = 1065561606503 is a prime.

It is a super-2 number, since 2×1065561606505² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1065561606503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3437829 + ... + 3734941.

It is an arithmetic number, because the mean of its divisors is an integer number (43944943284).

Almost surely, 2^{1065561606505} is an apocalyptic number.

It is an amenable number.

1065561606505 is a deficient number, since it is larger than the sum of its proper divisors (340676578583).

1065561606505 is a wasteful number, since it uses less digits than its factorization.

1065561606505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297657.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 1065561606505 in words is "one trillion, sixty-five billion, five hundred sixty-one million, six hundred six thousand, five hundred five".