1165026500645 has 16 divisors (see below), whose sum is σ = 1667218049280. Its totient is φ = 764141604864.

The previous prime is 1165026500471. The next prime is 1165026500653. The reversal of 1165026500645 is 5460056205611.

It is a cyclic number.

It is not a de Polignac number, because 1165026500645 - 2²² = 1165022306341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 723618140 + ... + 723619749.

It is an arithmetic number, because the mean of its divisors is an integer number (104201128080).

Almost surely, 2^{1165026500645} is an apocalyptic number.

It is an amenable number.

1165026500645 is a deficient number, since it is larger than the sum of its proper divisors (502191548635).

1165026500645 is a wasteful number, since it uses less digits than its factorization.

1165026500645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447237924.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 1165026500645 in words is "one trillion, one hundred sixty-five billion, twenty-six million, five hundred thousand, six hundred forty-five".