123779667122857 has 2 divisors, whose sum is σ = 123779667122858. Its totient is φ = 123779667122856.

The previous prime is 123779667122821. The next prime is 123779667122861. The reversal of 123779667122857 is 758221766977321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122357136218256 + 1422530904601 = 11061516^2 + 1192699^2 .

It is a cyclic number.

It is not a de Polignac number, because 123779667122857 - 2⁷ = 123779667122729 is a prime.

It is a super-2 number, since 2×123779667122857² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123779667122857.

It is not a weakly prime, because it can be changed into another prime (123779667122957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61889833561428 + 61889833561429.

It is an arithmetic number, because the mean of its divisors is an integer number (61889833561429).

Almost surely, 2^{123779667122857} is an apocalyptic number.

It is an amenable number.

123779667122857 is a deficient number, since it is larger than the sum of its proper divisors (1).

123779667122857 is an equidigital number, since it uses as much as digits as its factorization.

123779667122857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746807040, while the sum is 73.

The spelling of 123779667122857 in words is "one hundred twenty-three trillion, seven hundred seventy-nine billion, six hundred sixty-seven million, one hundred twenty-two thousand, eight hundred fifty-seven".