1165138168865 has 48 divisors (see below), whose sum is σ = 1697977862784. Its totient is φ = 762852456960.

The previous prime is 1165138168847. The next prime is 1165138168889. The reversal of 1165138168865 is 5688618315611.

It is not a de Polignac number, because 1165138168865 - 2²² = 1165133974561 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2226167 + ... + 2699276.

It is an arithmetic number, because the mean of its divisors is an integer number (35374538808).

Almost surely, 2^{1165138168865} is an apocalyptic number.

It is an amenable number.

1165138168865 is a deficient number, since it is larger than the sum of its proper divisors (532839693919).

1165138168865 is a wasteful number, since it uses less digits than its factorization.

1165138168865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4925510 (or 4925499 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 59.

The spelling of 1165138168865 in words is "one trillion, one hundred sixty-five billion, one hundred thirty-eight million, one hundred sixty-eight thousand, eight hundred sixty-five".