8444261691 has 16 divisors (see below), whose sum is σ = 12515328000. Its totient is φ = 5627118024.

The previous prime is 8444261687. The next prime is 8444261711. The reversal of 8444261691 is 1961624448.

It is not a de Polignac number, because 8444261691 - 2² = 8444261687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8444261681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411 + ... + 129956.

It is an arithmetic number, because the mean of its divisors is an integer number (782208000).

Almost surely, 2^8444261691 is an apocalyptic number.

8444261691 is a deficient number, since it is larger than the sum of its proper divisors (4071066309).

8444261691 is a wasteful number, since it uses less digits than its factorization.

8444261691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132775 (or 132769 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 8444261691 is about 91892.6639672613. The cubic root of 8444261691 is about 2036.3568910375.

The spelling of 8444261691 in words is "eight billion, four hundred forty-four million, two hundred sixty-one thousand, six hundred ninety-one".