123511500013 has 16 divisors (see below), whose sum is σ = 139083969024. Its totient is φ = 108693869760.

The previous prime is 123511499971. The next prime is 123511500053. The reversal of 123511500013 is 310005115321.

It is a cyclic number.

It is not a de Polignac number, because 123511500013 - 2¹³ = 123511491821 is a prime.

It is a super-2 number, since 2×123511500013² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123511500053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690045 + ... + 850402.

It is an arithmetic number, because the mean of its divisors is an integer number (8692748064).

Almost surely, 2^123511500013 is an apocalyptic number.

It is an amenable number.

123511500013 is a deficient number, since it is larger than the sum of its proper divisors (15572469011).

123511500013 is a wasteful number, since it uses less digits than its factorization.

123511500013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540692.

The product of its (nonzero) digits is 450, while the sum is 22.

Adding to 123511500013 its reverse (310005115321), we get a palindrome (433516615334).

The spelling of 123511500013 in words is "one hundred twenty-three billion, five hundred eleven million, five hundred thousand, thirteen".