538140806665 has 16 divisors (see below), whose sum is σ = 805114558080. Its totient is φ = 335464398720.

The previous prime is 538140806663. The next prime is 538140806711. The reversal of 538140806665 is 566608041835.

It is not a de Polignac number, because 538140806665 - 2¹ = 538140806663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (538140806663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 698883780 + ... + 698884549.

It is an arithmetic number, because the mean of its divisors is an integer number (50319659880).

Almost surely, 2^538140806665 is an apocalyptic number.

538140806665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

538140806665 is a deficient number, since it is larger than the sum of its proper divisors (266973751415).

538140806665 is a wasteful number, since it uses less digits than its factorization.

538140806665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397768352.

The product of its (nonzero) digits is 4147200, while the sum is 52.

The spelling of 538140806665 in words is "five hundred thirty-eight billion, one hundred forty million, eight hundred six thousand, six hundred sixty-five".