123780493265761 has 2 divisors, whose sum is σ = 123780493265762. Its totient is φ = 123780493265760.

The previous prime is 123780493265753. The next prime is 123780493265813. The reversal of 123780493265761 is 167562394087321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102470452227361 + 21310041038400 = 10122769^2 + 4616280^2 .

It is an emirp because it is prime and its reverse (167562394087321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123780493265761 - 2³ = 123780493265753 is a prime.

It is a super-2 number, since 2×123780493265761² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123780493265693 and 123780493265702.

It is not a weakly prime, because it can be changed into another prime (123780493265711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61890246632880 + 61890246632881.

It is an arithmetic number, because the mean of its divisors is an integer number (61890246632881).

It is a 2-persistent number, because it is pandigital, and so is 2⋅123780493265761 = 247560986531522, but 3⋅123780493265761 = 371341479797283 is not.

Almost surely, 2^{123780493265761} is an apocalyptic number.

It is an amenable number.

123780493265761 is a deficient number, since it is larger than the sum of its proper divisors (1).

123780493265761 is an equidigital number, since it uses as much as digits as its factorization.

123780493265761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91445760, while the sum is 64.

The spelling of 123780493265761 in words is "one hundred twenty-three trillion, seven hundred eighty billion, four hundred ninety-three million, two hundred sixty-five thousand, seven hundred sixty-one".