1917783851377 has 2 divisors, whose sum is σ = 1917783851378. Its totient is φ = 1917783851376.

The previous prime is 1917783851327. The next prime is 1917783851387. The reversal of 1917783851377 is 7731583877191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1517045475856 + 400738375521 = 1231684^2 + 633039^2 .

It is an emirp because it is prime and its reverse (7731583877191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1917783851377 is a prime.

It is a super-2 number, since 2×1917783851377² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1917783851327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958891925688 + 958891925689.

It is an arithmetic number, because the mean of its divisors is an integer number (958891925689).

Almost surely, 2^{1917783851377} is an apocalyptic number.

It is an amenable number.

1917783851377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1917783851377 is an equidigital number, since it uses as much as digits as its factorization.

1917783851377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62233920, while the sum is 67.

The spelling of 1917783851377 in words is "one trillion, nine hundred seventeen billion, seven hundred eighty-three million, eight hundred fifty-one thousand, three hundred seventy-seven".