123543534577 has 4 divisors (see below), whose sum is σ = 124170659316. Its totient is φ = 122916409840.

The previous prime is 123543534533. The next prime is 123543534589. The reversal of 123543534577 is 775435345321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62078712336 + 61464822241 = 249156^2 + 247921^2 .

It is a cyclic number.

It is not a de Polignac number, because 123543534577 - 2³¹ = 121396050929 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123543534577.

It is not an unprimeable number, because it can be changed into a prime (123543531577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313562074 + ... + 313562467.

It is an arithmetic number, because the mean of its divisors is an integer number (31042664829).

Almost surely, 2^123543534577 is an apocalyptic number.

It is an amenable number.

123543534577 is a deficient number, since it is larger than the sum of its proper divisors (627124739).

123543534577 is an equidigital number, since it uses as much as digits as its factorization.

123543534577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627124738.

The product of its digits is 5292000, while the sum is 49.

Adding to 123543534577 its reverse (775435345321), we get a palindrome (898978879898).

The spelling of 123543534577 in words is "one hundred twenty-three billion, five hundred forty-three million, five hundred thirty-four thousand, five hundred seventy-seven".