40449705891 has 16 divisors (see below), whose sum is σ = 64881734400. Its totient is φ = 21897584928.

The previous prime is 40449705883. The next prime is 40449705931. The reversal of 40449705891 is 19850794404.

It is not a de Polignac number, because 40449705891 - 2³ = 40449705883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40449705391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50688456 + ... + 50689253.

It is an arithmetic number, because the mean of its divisors is an integer number (4055108400).

Almost surely, 2^40449705891 is an apocalyptic number.

40449705891 is a deficient number, since it is larger than the sum of its proper divisors (24432028509).

40449705891 is a wasteful number, since it uses less digits than its factorization.

40449705891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101377738.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 40449705891 in words is "forty billion, four hundred forty-nine million, seven hundred five thousand, eight hundred ninety-one".