1911051644857 has 2 divisors, whose sum is σ = 1911051644858. Its totient is φ = 1911051644856.

The previous prime is 1911051644813. The next prime is 1911051644881. The reversal of 1911051644857 is 7584461501191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1503115232256 + 407936412601 = 1226016^2 + 638699^2 .

It is an emirp because it is prime and its reverse (7584461501191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1911051644857 - 2⁷ = 1911051644729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1911051644057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 955525822428 + 955525822429.

It is an arithmetic number, because the mean of its divisors is an integer number (955525822429).

Almost surely, 2^{1911051644857} is an apocalyptic number.

It is an amenable number.

1911051644857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1911051644857 is an equidigital number, since it uses as much as digits as its factorization.

1911051644857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 52.

The spelling of 1911051644857 in words is "one trillion, nine hundred eleven billion, fifty-one million, six hundred forty-four thousand, eight hundred fifty-seven".