1161155265027 has 4 divisors (see below), whose sum is σ = 1548207020040. Its totient is φ = 774103510016.

The previous prime is 1161155265007. The next prime is 1161155265077. The reversal of 1161155265027 is 7205625511611.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1161155265027 - 2¹¹ = 1161155262979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1161155265027.

It is not an unprimeable number, because it can be changed into a prime (1161155265007) 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, 193525877502 + ... + 193525877507.

It is an arithmetic number, because the mean of its divisors is an integer number (387051755010).

Almost surely, 2^{1161155265027} is an apocalyptic number.

1161155265027 is a deficient number, since it is larger than the sum of its proper divisors (387051755013).

1161155265027 is an equidigital number, since it uses as much as digits as its factorization.

1161155265027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387051755012.

The product of its (nonzero) digits is 126000, while the sum is 42.

The spelling of 1161155265027 in words is "one trillion, one hundred sixty-one billion, one hundred fifty-five million, two hundred sixty-five thousand, twenty-seven".