16201905433381 has 4 divisors (see below), whose sum is σ = 16362320338764. Its totient is φ = 16041490528000.

The previous prime is 16201905433349. The next prime is 16201905433403. The reversal of 16201905433381 is 18333450910261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7792282429156 + 8409623004225 = 2791466^2 + 2899935^2 .

It is a cyclic number.

It is not a de Polignac number, because 16201905433381 - 2⁵ = 16201905433349 is a prime.

It is a super-2 number, since 2×16201905433381² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16201905433781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80207452540 + ... + 80207452741.

It is an arithmetic number, because the mean of its divisors is an integer number (4090580084691).

Almost surely, 2^{16201905433381} is an apocalyptic number.

It is an amenable number.

16201905433381 is a deficient number, since it is larger than the sum of its proper divisors (160414905383).

16201905433381 is a wasteful number, since it uses less digits than its factorization.

16201905433381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160414905382.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 16201905433381 in words is "sixteen trillion, two hundred one billion, nine hundred five million, four hundred thirty-three thousand, three hundred eighty-one".