123205432545 has 96 divisors (see below), whose sum is σ = 243903284352. Its totient is φ = 56995301376.

The previous prime is 123205432543. The next prime is 123205432561. The reversal of 123205432545 is 545234502321.

123205432545 is a `hidden beast` number, since 1 + 2 + 32 + 0 + 54 + 32 + 545 = 666.

It is not a de Polignac number, because 123205432545 - 2¹ = 123205432543 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123205432541) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6385002 + ... + 6404268.

It is an arithmetic number, because the mean of its divisors is an integer number (2540659212).

Almost surely, 2^123205432545 is an apocalyptic number.

123205432545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123205432545 is a deficient number, since it is larger than the sum of its proper divisors (120697851807).

123205432545 is a wasteful number, since it uses less digits than its factorization.

123205432545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19951 (or 19948 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 123205432545 its reverse (545234502321), we get a palindrome (668439934866).

The spelling of 123205432545 in words is "one hundred twenty-three billion, two hundred five million, four hundred thirty-two thousand, five hundred forty-five".