1966277256457 has 2 divisors, whose sum is σ = 1966277256458. Its totient is φ = 1966277256456.

The previous prime is 1966277256413. The next prime is 1966277256467. The reversal of 1966277256457 is 7546527726691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1851697714441 + 114579542016 = 1360771^2 + 338496^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966277256457 - 2³⁹ = 1416521442569 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1966277256392 and 1966277256401.

It is not a weakly prime, because it can be changed into another prime (1966277256467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983138628228 + 983138628229.

It is an arithmetic number, because the mean of its divisors is an integer number (983138628229).

Almost surely, 2^{1966277256457} is an apocalyptic number.

It is an amenable number.

1966277256457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966277256457 is an equidigital number, since it uses as much as digits as its factorization.

1966277256457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 266716800, while the sum is 67.

The spelling of 1966277256457 in words is "one trillion, nine hundred sixty-six billion, two hundred seventy-seven million, two hundred fifty-six thousand, four hundred fifty-seven".