8409666291 has 12 divisors (see below), whose sum is σ = 12141767448. Its totient is φ = 5175178944.

The previous prime is 8409666277. The next prime is 8409666299. The reversal of 8409666291 is 1926669048.

It is not a de Polignac number, because 8409666291 - 2⁵ = 8409666259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8409666299) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8293050 + ... + 8294063.

It is an arithmetic number, because the mean of its divisors is an integer number (1011813954).

Almost surely, 2^8409666291 is an apocalyptic number.

8409666291 is a deficient number, since it is larger than the sum of its proper divisors (3732101157).

8409666291 is a wasteful number, since it uses less digits than its factorization.

8409666291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16587142 (or 16587129 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The square root of 8409666291 is about 91704.2326776687. The cubic root of 8409666291 is about 2033.5721594031.

The spelling of 8409666291 in words is "eight billion, four hundred nine million, six hundred sixty-six thousand, two hundred ninety-one".