123575543657 has 2 divisors, whose sum is σ = 123575543658. Its totient is φ = 123575543656.

The previous prime is 123575543627. The next prime is 123575543711. The reversal of 123575543657 is 756345575321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110838389776 + 12737153881 = 332924^2 + 112859^2 .

It is a cyclic number.

It is not a de Polignac number, because 123575543657 - 2⁸ = 123575543401 is a prime.

It is a super-2 number, since 2×123575543657² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123575543599 and 123575543608.

It is not a weakly prime, because it can be changed into another prime (123575543627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61787771828 + 61787771829.

It is an arithmetic number, because the mean of its divisors is an integer number (61787771829).

Almost surely, 2^123575543657 is an apocalyptic number.

It is an amenable number.

123575543657 is a deficient number, since it is larger than the sum of its proper divisors (1).

123575543657 is an equidigital number, since it uses as much as digits as its factorization.

123575543657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230000, while the sum is 53.

The spelling of 123575543657 in words is "one hundred twenty-three billion, five hundred seventy-five million, five hundred forty-three thousand, six hundred fifty-seven".