165205531653 has 16 divisors (see below), whose sum is σ = 226246596096. Its totient is φ = 107151249600.

The previous prime is 165205531643. The next prime is 165205531679. The reversal of 165205531653 is 356135502561.

It is not a de Polignac number, because 165205531653 - 2⁴ = 165205531637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165205531643) 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, 1403175 + ... + 1516347.

It is an arithmetic number, because the mean of its divisors is an integer number (14140412256).

Almost surely, 2^165205531653 is an apocalyptic number.

It is an amenable number.

165205531653 is a deficient number, since it is larger than the sum of its proper divisors (61041064443).

165205531653 is a wasteful number, since it uses less digits than its factorization.

165205531653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126364.

The product of its (nonzero) digits is 405000, while the sum is 42.

The spelling of 165205531653 in words is "one hundred sixty-five billion, two hundred five million, five hundred thirty-one thousand, six hundred fifty-three".