123545509988 has 6 divisors (see below), whose sum is σ = 216204642486. Its totient is φ = 61772754992.

The previous prime is 123545509987. The next prime is 123545510003. The reversal of 123545509988 is 889905545321.

It can be written as a sum of positive squares in only one way, i.e., 71983816804 + 51561693184 = 268298^2 + 227072^2 .

It is not an unprimeable number, because it can be changed into a prime (123545509987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15443188745 + ... + 15443188752.

It is an arithmetic number, because the mean of its divisors is an integer number (36034107081).

Almost surely, 2^123545509988 is an apocalyptic number.

It is an amenable number.

123545509988 is a deficient number, since it is larger than the sum of its proper divisors (92659132498).

123545509988 is a wasteful number, since it uses less digits than its factorization.

123545509988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30886377501 (or 30886377499 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 59.

The spelling of 123545509988 in words is "one hundred twenty-three billion, five hundred forty-five million, five hundred nine thousand, nine hundred eighty-eight".