123557145512 has 8 divisors (see below), whose sum is σ = 231669647850. Its totient is φ = 61778572752.

The previous prime is 123557145493. The next prime is 123557145619. The reversal of 123557145512 is 215541755321.

It can be written as a sum of positive squares in only one way, i.e., 96158288836 + 27398856676 = 310094^2 + 165526^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 123557145512.

It is an unprimeable number.

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, 7722321587 + ... + 7722321602.

Almost surely, 2^123557145512 is an apocalyptic number.

It is an amenable number.

123557145512 is a deficient number, since it is larger than the sum of its proper divisors (108112502338).

123557145512 is a wasteful number, since it uses less digits than its factorization.

123557145512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15444643195 (or 15444643191 counting only the distinct ones).

The product of its digits is 210000, while the sum is 41.

The spelling of 123557145512 in words is "one hundred twenty-three billion, five hundred fifty-seven million, one hundred forty-five thousand, five hundred twelve".