16405702381 has 2 divisors, whose sum is σ = 16405702382. Its totient is φ = 16405702380.

The previous prime is 16405702351. The next prime is 16405702387. The reversal of 16405702381 is 18320750461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15582528900 + 823173481 = 124830^2 + 28691^2 .

It is a cyclic number.

It is not a de Polignac number, because 16405702381 - 2¹³ = 16405694189 is a prime.

It is a super-2 number, since 2×16405702381² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16405702381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16405702387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8202851190 + 8202851191.

It is an arithmetic number, because the mean of its divisors is an integer number (8202851191).

Almost surely, 2^16405702381 is an apocalyptic number.

It is an amenable number.

16405702381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16405702381 is an equidigital number, since it uses as much as digits as its factorization.

16405702381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 16405702381 in words is "sixteen billion, four hundred five million, seven hundred two thousand, three hundred eighty-one".