40440864825 has 18 divisors (see below), whose sum is σ = 72434082734. Its totient is φ = 21568461120.

The previous prime is 40440864809. The next prime is 40440864859. The reversal of 40440864825 is 52846804404.

It can be written as a sum of positive squares in 3 ways, for example, as 573554601 + 39867310224 = 23949^2 + 199668^2 .

It is not a de Polignac number, because 40440864825 - 2⁴ = 40440864809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 89868364 + ... + 89868813.

Almost surely, 2^40440864825 is an apocalyptic number.

40440864825 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40440864825 is a deficient number, since it is larger than the sum of its proper divisors (31993217909).

40440864825 is a wasteful number, since it uses less digits than its factorization.

40440864825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179737193 (or 179737185 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 45.

The spelling of 40440864825 in words is "forty billion, four hundred forty million, eight hundred sixty-four thousand, eight hundred twenty-five".