123735135577 has 4 divisors (see below), whose sum is σ = 128001864420. Its totient is φ = 119468406736.

The previous prime is 123735135553. The next prime is 123735135607. The reversal of 123735135577 is 775531537321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 775531537321 = 43 ⋅18035617147.

It can be written as a sum of positive squares in 2 ways, for example, as 59163751696 + 64571383881 = 243236^2 + 254109^2 .

It is a cyclic number.

It is not a de Polignac number, because 123735135577 - 2⁷ = 123735135449 is a prime.

It is a super-2 number, since 2×123735135577² (a number of 23 digits) contains 22 as substring.

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 123735135577.

It is not an unprimeable number, because it can be changed into a prime (123735135977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133364378 + ... + 2133364435.

It is an arithmetic number, because the mean of its divisors is an integer number (32000466105).

Almost surely, 2^123735135577 is an apocalyptic number.

It is an amenable number.

123735135577 is a deficient number, since it is larger than the sum of its proper divisors (4266728843).

123735135577 is an equidigital number, since it uses as much as digits as its factorization.

123735135577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266728842.

The product of its digits is 2315250, while the sum is 49.

The spelling of 123735135577 in words is "one hundred twenty-three billion, seven hundred thirty-five million, one hundred thirty-five thousand, five hundred seventy-seven".