1966371947 has 4 divisors (see below), whose sum is σ = 2008209696. Its totient is φ = 1924534200.

The previous prime is 1966371937. The next prime is 1966371961. The reversal of 1966371947 is 7491736691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7491736691 = 47 ⋅159398653.

It is a cyclic number.

It is not a de Polignac number, because 1966371947 - 2¹⁴ = 1966355563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966371907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20918804 + ... + 20918897.

It is an arithmetic number, because the mean of its divisors is an integer number (502052424).

Almost surely, 2^1966371947 is an apocalyptic number.

1966371947 is a deficient number, since it is larger than the sum of its proper divisors (41837749).

1966371947 is an equidigital number, since it uses as much as digits as its factorization.

1966371947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41837748.

The product of its digits is 1714608, while the sum is 53.

The square root of 1966371947 is about 44343.7926546659. The cubic root of 1966371947 is about 1252.8196502357.

The spelling of 1966371947 in words is "one billion, nine hundred sixty-six million, three hundred seventy-one thousand, nine hundred forty-seven".