123665235541 has 2 divisors, whose sum is σ = 123665235542. Its totient is φ = 123665235540.

The previous prime is 123665235539. The next prime is 123665235593. The reversal of 123665235541 is 145532566321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95490270225 + 28174965316 = 309015^2 + 167854^2 .

It is a cyclic number.

It is not a de Polignac number, because 123665235541 - 2¹ = 123665235539 is a prime.

It is a super-2 number, since 2×123665235541² (a number of 23 digits) contains 22 as substring.

Together with 123665235539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123665235521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61832617770 + 61832617771.

It is an arithmetic number, because the mean of its divisors is an integer number (61832617771).

Almost surely, 2^123665235541 is an apocalyptic number.

It is an amenable number.

123665235541 is a deficient number, since it is larger than the sum of its proper divisors (1).

123665235541 is an equidigital number, since it uses as much as digits as its factorization.

123665235541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 43.

The spelling of 123665235541 in words is "one hundred twenty-three billion, six hundred sixty-five million, two hundred thirty-five thousand, five hundred forty-one".