117921877145857 has 2 divisors, whose sum is σ = 117921877145858. Its totient is φ = 117921877145856.

The previous prime is 117921877145833. The next prime is 117921877145873. The reversal of 117921877145857 is 758541778129711.

It is a Cunningham number, because it is equal to 10859184²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117921877145856 + 1 = 10859184^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 117921877145857 - 2⁷ = 117921877145729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117921877145857.

It is not a weakly prime, because it can be changed into another prime (117921877145257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58960938572928 + 58960938572929.

It is an arithmetic number, because the mean of its divisors is an integer number (58960938572929).

Almost surely, 2^{117921877145857} is an apocalyptic number.

It is an amenable number.

117921877145857 is a deficient number, since it is larger than the sum of its proper divisors (1).

117921877145857 is an equidigital number, since it uses as much as digits as its factorization.

117921877145857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276595200, while the sum is 73.

The spelling of 117921877145857 in words is "one hundred seventeen trillion, nine hundred twenty-one billion, eight hundred seventy-seven million, one hundred forty-five thousand, eight hundred fifty-seven".