8961444915989 has 4 divisors (see below), whose sum is σ = 9108353849100. Its totient is φ = 8814535982880.

The previous prime is 8961444915919. The next prime is 8961444915991. The reversal of 8961444915989 is 9895194441698.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81700503889 + 8879744412100 = 285833^2 + 2979890^2 .

It is a cyclic number.

It is not a de Polignac number, because 8961444915989 - 2²⁰ = 8961443867413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8961444915919) 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, 73454466464 + ... + 73454466585.

It is an arithmetic number, because the mean of its divisors is an integer number (2277088462275).

Almost surely, 2^{8961444915989} is an apocalyptic number.

It is an amenable number.

8961444915989 is a deficient number, since it is larger than the sum of its proper divisors (146908933111).

8961444915989 is a wasteful number, since it uses less digits than its factorization.

8961444915989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146908933110.

The product of its digits is 806215680, while the sum is 77.

The spelling of 8961444915989 in words is "eight trillion, nine hundred sixty-one billion, four hundred forty-four million, nine hundred fifteen thousand, nine hundred eighty-nine".