1155664665061 has 4 divisors (see below), whose sum is σ = 1155738624300. Its totient is φ = 1155590705824.

The previous prime is 1155664665053. The next prime is 1155664665139. The reversal of 1155664665061 is 1605664665511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 977120388036 + 178544277025 = 988494^2 + 422545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155664665061 - 2³ = 1155664665053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155664665461) 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, 36956176 + ... + 36987433.

It is an arithmetic number, because the mean of its divisors is an integer number (288934656075).

Almost surely, 2^{1155664665061} is an apocalyptic number.

It is an amenable number.

1155664665061 is a deficient number, since it is larger than the sum of its proper divisors (73959239).

1155664665061 is an equidigital number, since it uses as much as digits as its factorization.

1155664665061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73959238.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 1155664665061 in words is "one trillion, one hundred fifty-five billion, six hundred sixty-four million, six hundred sixty-five thousand, sixty-one".