16043121640 has 128 divisors (see below), whose sum is σ = 44487797760. Its totient is φ = 5070449664.

The previous prime is 16043121623. The next prime is 16043121641. The reversal of 16043121640 is 4612134061.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 16043121599 and 16043121608.

It is not an unprimeable number, because it can be changed into a prime (16043121641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3102337 + ... + 3107503.

It is an arithmetic number, because the mean of its divisors is an integer number (347560920).

Almost surely, 2^16043121640 is an apocalyptic number.

16043121640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16043121640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22243898880).

16043121640 is an abundant number, since it is smaller than the sum of its proper divisors (28444676120).

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

16043121640 is a wasteful number, since it uses less digits than its factorization.

16043121640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6051 (or 6047 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 16043121640 in words is "sixteen billion, forty-three million, one hundred twenty-one thousand, six hundred forty".