1161155265072 has 80 divisors (see below), whose sum is σ = 3272979301632. Its totient is φ = 351797205760.

The previous prime is 1161155265007. The next prime is 1161155265077. The reversal of 1161155265072 is 2705625511611.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1161155265077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2555173 + ... + 2975099.

Almost surely, 2^{1161155265072} is an apocalyptic number.

1161155265072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1161155265072 is an abundant number, since it is smaller than the sum of its proper divisors (2111824036560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161155265072 is a wasteful number, since it uses less digits than its factorization.

1161155265072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425186 (or 425180 counting only the distinct ones).

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

The spelling of 1161155265072 in words is "one trillion, one hundred sixty-one billion, one hundred fifty-five million, two hundred sixty-five thousand, seventy-two".