43121716639 has 8 divisors (see below), whose sum is σ = 45686835648. Its totient is φ = 40559769600.

The previous prime is 43121716609. The next prime is 43121716643. The reversal of 43121716639 is 93661712134.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43121716639 - 2¹¹ = 43121714591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43121716595 and 43121716604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43121716609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764967 + ... + 819400.

It is an arithmetic number, because the mean of its divisors is an integer number (5710854456).

Almost surely, 2^43121716639 is an apocalyptic number.

43121716639 is a deficient number, since it is larger than the sum of its proper divisors (2565119009).

43121716639 is a wasteful number, since it uses less digits than its factorization.

43121716639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585985.

The product of its digits is 163296, while the sum is 43.

The spelling of 43121716639 in words is "forty-three billion, one hundred twenty-one million, seven hundred sixteen thousand, six hundred thirty-nine".