43121716640 has 48 divisors (see below), whose sum is σ = 102061505952. Its totient is φ = 17217118464.

The previous prime is 43121716609. The next prime is 43121716643. The reversal of 43121716640 is 4661712134.

It is a self number, because there is not a number n which added to its sum of digits gives 43121716640.

It is not an unprimeable number, because it can be changed into a prime (43121716643) 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, 158834 + ... + 333873.

It is an arithmetic number, because the mean of its divisors is an integer number (2126281374).

Almost surely, 2^43121716640 is an apocalyptic number.

43121716640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43121716640 is an abundant number, since it is smaller than the sum of its proper divisors (58939789312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43121716640 is a wasteful number, since it uses less digits than its factorization.

43121716640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493269 (or 493261 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 43121716640 in words is "forty-three billion, one hundred twenty-one million, seven hundred sixteen thousand, six hundred forty".