123511550505 has 16 divisors (see below), whose sum is σ = 225849692544. Its totient is φ = 56462423040.

The previous prime is 123511550483. The next prime is 123511550527. The reversal of 123511550505 is 505055115321.

It is an interprime number because it is at equal distance from previous prime (123511550483) and next prime (123511550527).

It is not a de Polignac number, because 123511550505 - 2⁵ = 123511550473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 588150136 + ... + 588150345.

It is an arithmetic number, because the mean of its divisors is an integer number (14115605784).

Almost surely, 2^123511550505 is an apocalyptic number.

123511550505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123511550505 is a deficient number, since it is larger than the sum of its proper divisors (102338142039).

123511550505 is a wasteful number, since it uses less digits than its factorization.

123511550505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176300496.

The product of its (nonzero) digits is 18750, while the sum is 33.

Adding to 123511550505 its reverse (505055115321), we get a palindrome (628566665826).

The spelling of 123511550505 in words is "one hundred twenty-three billion, five hundred eleven million, five hundred fifty thousand, five hundred five".