123645453975 has 36 divisors (see below), whose sum is σ = 221567626800. Its totient is φ = 65913012480.

The previous prime is 123645453931. The next prime is 123645453989. The reversal of 123645453975 is 579354546321.

123645453975 is a `hidden beast` number, since 1 + 2 + 3 + 6 + 4 + 545 + 3 + 97 + 5 = 666.

It is not a de Polignac number, because 123645453975 - 2¹⁰ = 123645452951 is a prime.

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 349966 + ... + 608084.

It is an arithmetic number, because the mean of its divisors is an integer number (6154656300).

Almost surely, 2^123645453975 is an apocalyptic number.

123645453975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123645453975 is a deficient number, since it is larger than the sum of its proper divisors (97922172825).

123645453975 is a wasteful number, since it uses less digits than its factorization.

123645453975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260264 (or 260256 counting only the distinct ones).

The product of its digits is 13608000, while the sum is 54.

The spelling of 123645453975 in words is "one hundred twenty-three billion, six hundred forty-five million, four hundred fifty-three thousand, nine hundred seventy-five".