8644421901 has 8 divisors (see below), whose sum is σ = 11534001280. Its totient is φ = 5758898076.

The previous prime is 8644421893. The next prime is 8644421909. The reversal of 8644421901 is 1091244468.

It is an interprime number because it is at equal distance from previous prime (8644421893) and next prime (8644421909).

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=1423.

It is not a de Polignac number, because 8644421901 - 2³ = 8644421893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8644421901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8644421909) 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, 6074076 + ... + 6075498.

It is an arithmetic number, because the mean of its divisors is an integer number (1441750160).

Almost surely, 2^8644421901 is an apocalyptic number.

It is an amenable number.

8644421901 is a deficient number, since it is larger than the sum of its proper divisors (2889579379).

8644421901 is an frugal number, since it uses more digits than its factorization.

8644421901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272 (or 1426 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 8644421901 is about 92975.3833065506. The cubic root of 8644421901 is about 2052.3211385474.

It can be divided in two parts, 86444 and 21901, that added together give a triangular number (108345 = T₄₆₅).

The spelling of 8644421901 in words is "eight billion, six hundred forty-four million, four hundred twenty-one thousand, nine hundred one".