16105921540 has 24 divisors (see below), whose sum is σ = 33842437272. Its totient is φ = 6438558720.

The previous prime is 16105921523. The next prime is 16105921543. The reversal of 16105921540 is 4512950161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1458628864 + 14647292676 = 38192^2 + 121026^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16105921496 and 16105921505.

It is not an unprimeable number, because it can be changed into a prime (16105921543) 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, 203331 + ... + 271210.

It is an arithmetic number, because the mean of its divisors is an integer number (1410101553).

Almost surely, 2^16105921540 is an apocalyptic number.

16105921540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16105921540 is an abundant number, since it is smaller than the sum of its proper divisors (17736515732).

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

16105921540 is a wasteful number, since it uses less digits than its factorization.

16105921540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476247 (or 476245 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 16105921540 in words is "sixteen billion, one hundred five million, nine hundred twenty-one thousand, five hundred forty".