1165611506013 has 24 divisors (see below), whose sum is σ = 1805175861440. Its totient is φ = 743288487480.

The previous prime is 1165611506011. The next prime is 1165611506027. The reversal of 1165611506013 is 3106051165611.

1165611506013 is a `hidden beast` number, since 1 + 16 + 561 + 15 + 0 + 60 + 13 = 666.

It is not a de Polignac number, because 1165611506013 - 2¹ = 1165611506011 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165611506011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40789873 + ... + 40818438.

Almost surely, 2^{1165611506013} is an apocalyptic number.

It is an amenable number.

1165611506013 is a deficient number, since it is larger than the sum of its proper divisors (639564355427).

1165611506013 is an equidigital number, since it uses as much as digits as its factorization.

1165611506013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81608366 (or 81608337 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 1165611506013 in words is "one trillion, one hundred sixty-five billion, six hundred eleven million, five hundred six thousand, thirteen".