864921944489 has 4 divisors (see below), whose sum is σ = 864924061824. Its totient is φ = 864919827156.

The previous prime is 864921944423. The next prime is 864921944501. The reversal of 864921944489 is 984449129468.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 864921944489 - 2⁸ = 864921944233 is a prime.

It is a super-2 number, since 2×864921944489² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864921943489) 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, 229397 + ... + 1335090.

It is an arithmetic number, because the mean of its divisors is an integer number (216231015456).

Almost surely, 2^864921944489 is an apocalyptic number.

It is an amenable number.

864921944489 is a deficient number, since it is larger than the sum of its proper divisors (2117335).

864921944489 is a wasteful number, since it uses less digits than its factorization.

864921944489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117334.

The product of its digits is 143327232, while the sum is 68.

The spelling of 864921944489 in words is "eight hundred sixty-four billion, nine hundred twenty-one million, nine hundred forty-four thousand, four hundred eighty-nine".