3991644943267 has 8 divisors (see below), whose sum is σ = 4088570703536. Its totient is φ = 3894905401632.

The previous prime is 3991644943219. The next prime is 3991644943283. The reversal of 3991644943267 is 7623494461993.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3991644943267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3991644943667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46511268 + ... + 46597009.

It is an arithmetic number, because the mean of its divisors is an integer number (511071337942).

Almost surely, 2^{3991644943267} is an apocalyptic number.

3991644943267 is a deficient number, since it is larger than the sum of its proper divisors (96925760269).

3991644943267 is an equidigital number, since it uses as much as digits as its factorization.

3991644943267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93109317.

The product of its digits is 211631616, while the sum is 67.

The spelling of 3991644943267 in words is "three trillion, nine hundred ninety-one billion, six hundred forty-four million, nine hundred forty-three thousand, two hundred sixty-seven".