40446091178989 has 4 divisors (see below), whose sum is σ = 40525553048220. Its totient is φ = 40366629309760.

The previous prime is 40446091178887. The next prime is 40446091179017. The reversal of 40446091178989 is 98987119064404.

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 38216295616489 + 2229795562500 = 6181933^2 + 1493250^2 .

It is a cyclic number.

It is not a de Polignac number, because 40446091178989 - 2⁴³ = 31649998156781 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 (40446091178189) 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, 39730933852 + ... + 39730934869.

It is an arithmetic number, because the mean of its divisors is an integer number (10131388262055).

Almost surely, 2^{40446091178989} is an apocalyptic number.

It is an amenable number.

40446091178989 is a deficient number, since it is larger than the sum of its proper divisors (79461869231).

40446091178989 is an equidigital number, since it uses as much as digits as its factorization.

40446091178989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79461869230.

The product of its (nonzero) digits is 125411328, while the sum is 70.

The spelling of 40446091178989 in words is "forty trillion, four hundred forty-six billion, ninety-one million, one hundred seventy-eight thousand, nine hundred eighty-nine".