43959920557 has 16 divisors (see below), whose sum is σ = 51606300672. Its totient is φ = 36655476480.

The previous prime is 43959920527. The next prime is 43959920561. The reversal of 43959920557 is 75502995934.

It is not a de Polignac number, because 43959920557 - 2⁷ = 43959920429 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 (43959920527) 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, 2257332 + ... + 2276722.

It is an arithmetic number, because the mean of its divisors is an integer number (3225393792).

Almost surely, 2^43959920557 is an apocalyptic number.

It is an amenable number.

43959920557 is a deficient number, since it is larger than the sum of its proper divisors (7646380115).

43959920557 is a wasteful number, since it uses less digits than its factorization.

43959920557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28188.

The product of its (nonzero) digits is 15309000, while the sum is 58.

The spelling of 43959920557 in words is "forty-three billion, nine hundred fifty-nine million, nine hundred twenty thousand, five hundred fifty-seven".