123213140565 has 64 divisors (see below), whose sum is σ = 216643680000. Its totient is φ = 59556446208.

The previous prime is 123213140563. The next prime is 123213140573. The reversal of 123213140565 is 565041312321.

It is not a de Polignac number, because 123213140565 - 2¹ = 123213140563 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123213140563) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 832501 + ... + 969269.

It is an arithmetic number, because the mean of its divisors is an integer number (3385057500).

Almost surely, 2^123213140565 is an apocalyptic number.

123213140565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123213140565 is a deficient number, since it is larger than the sum of its proper divisors (93430539435).

123213140565 is a wasteful number, since it uses less digits than its factorization.

123213140565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136934.

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 123213140565 its reverse (565041312321), we get a palindrome (688254452886).

The spelling of 123213140565 in words is "one hundred twenty-three billion, two hundred thirteen million, one hundred forty thousand, five hundred sixty-five".