1165605665601 has 32 divisors (see below), whose sum is σ = 1777079243520. Its totient is φ = 673221279744.

The previous prime is 1165605665597. The next prime is 1165605665641. The reversal of 1165605665601 is 1065665065611.

It is not a de Polignac number, because 1165605665601 - 2² = 1165605665597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165605665641) 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, 2210560 + ... + 2686593.

It is an arithmetic number, because the mean of its divisors is an integer number (55533726360).

Almost surely, 2^{1165605665601} is an apocalyptic number.

It is an amenable number.

1165605665601 is a deficient number, since it is larger than the sum of its proper divisors (611473577919).

1165605665601 is a wasteful number, since it uses less digits than its factorization.

1165605665601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4897545.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 1165605665601 in words is "one trillion, one hundred sixty-five billion, six hundred five million, six hundred sixty-five thousand, six hundred one".