8401654447891 has 4 divisors (see below), whose sum is σ = 8895869415432. Its totient is φ = 7907439480352.

The previous prime is 8401654447841. The next prime is 8401654447903. The reversal of 8401654447891 is 1987444561048.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8401654447891 - 2⁷ = 8401654447763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8401654447841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247107483745 + ... + 247107483778.

It is an arithmetic number, because the mean of its divisors is an integer number (2223967353858).

Almost surely, 2^{8401654447891} is an apocalyptic number.

8401654447891 is a deficient number, since it is larger than the sum of its proper divisors (494214967541).

8401654447891 is a wasteful number, since it uses less digits than its factorization.

8401654447891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494214967540.

The product of its (nonzero) digits is 30965760, while the sum is 61.

The spelling of 8401654447891 in words is "eight trillion, four hundred one billion, six hundred fifty-four million, four hundred forty-seven thousand, eight hundred ninety-one".