1966256427 has 4 divisors (see below), whose sum is σ = 2621675240. Its totient is φ = 1310837616.

The previous prime is 1966256423. The next prime is 1966256443. The reversal of 1966256427 is 7246526691.

1966256427 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7246526691 = 3 ⋅2415508897.

It is not a de Polignac number, because 1966256427 - 2² = 1966256423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966256423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327709402 + ... + 327709407.

It is an arithmetic number, because the mean of its divisors is an integer number (655418810).

Almost surely, 2^1966256427 is an apocalyptic number.

1966256427 is a deficient number, since it is larger than the sum of its proper divisors (655418813).

1966256427 is an equidigital number, since it uses as much as digits as its factorization.

1966256427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655418812.

The product of its digits is 1088640, while the sum is 48.

The square root of 1966256427 is about 44342.4900856955. The cubic root of 1966256427 is about 1252.7951162946.

The spelling of 1966256427 in words is "one billion, nine hundred sixty-six million, two hundred fifty-six thousand, four hundred twenty-seven".