1966736991 has 8 divisors (see below), whose sum is σ = 2659250304. Its totient is φ = 1292690840.

The previous prime is 1966736963. The next prime is 1966737023. The reversal of 1966736991 is 1996376691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1966736991 - 2⁶ = 1966736927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966736921) 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 7 ways as a sum of consecutive naturals, for example, 4616541 + ... + 4616966.

It is an arithmetic number, because the mean of its divisors is an integer number (332406288).

Almost surely, 2^1966736991 is an apocalyptic number.

1966736991 is a deficient number, since it is larger than the sum of its proper divisors (692513313).

1966736991 is an equidigital number, since it uses as much as digits as its factorization.

1966736991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9233581.

The product of its digits is 3306744, while the sum is 57.

The square root of 1966736991 is about 44347.9085301663. The cubic root of 1966736991 is about 1252.8971713441.

The spelling of 1966736991 in words is "one billion, nine hundred sixty-six million, seven hundred thirty-six thousand, nine hundred ninety-one".