123780504956791 has 2 divisors, whose sum is σ = 123780504956792. Its totient is φ = 123780504956790.

The previous prime is 123780504956659. The next prime is 123780504956809. The reversal of 123780504956791 is 197659405087321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123780504956791 - 2⁹ = 123780504956279 is a prime.

It is a super-2 number, since 2×123780504956791² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123780504956891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61890252478395 + 61890252478396.

It is an arithmetic number, because the mean of its divisors is an integer number (61890252478396).

It is a 2-persistent number, because it is pandigital, and so is 2⋅123780504956791 = 247561009913582, but 3⋅123780504956791 = 371341514870373 is not.

Almost surely, 2^{123780504956791} is an apocalyptic number.

123780504956791 is a deficient number, since it is larger than the sum of its proper divisors (1).

123780504956791 is an equidigital number, since it uses as much as digits as its factorization.

123780504956791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 114307200, while the sum is 67.

The spelling of 123780504956791 in words is "one hundred twenty-three trillion, seven hundred eighty billion, five hundred four million, nine hundred fifty-six thousand, seven hundred ninety-one".