16005620381 has 2 divisors, whose sum is σ = 16005620382. Its totient is φ = 16005620380.

The previous prime is 16005620369. The next prime is 16005620437. The reversal of 16005620381 is 18302650061.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11606614756 + 4399005625 = 107734^2 + 66325^2 .

It is an emirp because it is prime and its reverse (18302650061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16005620381 - 2³⁰ = 14931878557 is a prime.

It is a super-2 number, since 2×16005620381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16005625381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8002810190 + 8002810191.

It is an arithmetic number, because the mean of its divisors is an integer number (8002810191).

Almost surely, 2^16005620381 is an apocalyptic number.

It is an amenable number.

16005620381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16005620381 is an equidigital number, since it uses as much as digits as its factorization.

16005620381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 16005620381 in words is "sixteen billion, five million, six hundred twenty thousand, three hundred eighty-one".