1966277256479 has 4 divisors (see below), whose sum is σ = 1973274684720. Its totient is φ = 1959279828240.

The previous prime is 1966277256473. The next prime is 1966277256491. The reversal of 1966277256479 is 9746527726691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1966277256479 - 2³⁶ = 1897557779743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966277256473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3498713699 + ... + 3498714260.

It is an arithmetic number, because the mean of its divisors is an integer number (493318671180).

Almost surely, 2^{1966277256479} is an apocalyptic number.

1966277256479 is a deficient number, since it is larger than the sum of its proper divisors (6997428241).

1966277256479 is an equidigital number, since it uses as much as digits as its factorization.

1966277256479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997428240.

The product of its digits is 480090240, while the sum is 71.

The spelling of 1966277256479 in words is "one trillion, nine hundred sixty-six billion, two hundred seventy-seven million, two hundred fifty-six thousand, four hundred seventy-nine".