123513405155 has 32 divisors (see below), whose sum is σ = 172481978880. Its totient is φ = 83152512000.

The previous prime is 123513405131. The next prime is 123513405163. The reversal of 123513405155 is 551504315321.

It is not a de Polignac number, because 123513405155 - 2³² = 119218437859 is a prime.

It is a super-2 number, since 2×123513405155² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1587155 + ... + 1663155.

It is an arithmetic number, because the mean of its divisors is an integer number (5390061840).

Almost surely, 2^123513405155 is an apocalyptic number.

123513405155 is a deficient number, since it is larger than the sum of its proper divisors (48968573725).

123513405155 is an equidigital number, since it uses as much as digits as its factorization.

123513405155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76859.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 123513405155 in words is "one hundred twenty-three billion, five hundred thirteen million, four hundred five thousand, one hundred fifty-five".