123544643505 has 16 divisors (see below), whose sum is σ = 197678382144. Its totient is φ = 65888159040.

The previous prime is 123544643491. The next prime is 123544643527. The reversal of 123544643505 is 505346445321.

It is not a de Polignac number, because 123544643505 - 2⁴ = 123544643489 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, 350490 + ... + 608220.

It is an arithmetic number, because the mean of its divisors is an integer number (12354898884).

Almost surely, 2^123544643505 is an apocalyptic number.

123544643505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123544643505 is a deficient number, since it is larger than the sum of its proper divisors (74133738639).

123544643505 is a wasteful number, since it uses less digits than its factorization.

123544643505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289696.

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 123544643505 in words is "one hundred twenty-three billion, five hundred forty-four million, six hundred forty-three thousand, five hundred five".