16806928381 has 2 divisors, whose sum is σ = 16806928382. Its totient is φ = 16806928380.

The previous prime is 16806928319. The next prime is 16806928393. The reversal of 16806928381 is 18382960861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15494025625 + 1312902756 = 124475^2 + 36234^2 .

It is an emirp because it is prime and its reverse (18382960861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16806928381 - 2²¹ = 16804831229 is a prime.

It is a super-2 number, since 2×16806928381² (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 (16806928081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8403464190 + 8403464191.

It is an arithmetic number, because the mean of its divisors is an integer number (8403464191).

Almost surely, 2^16806928381 is an apocalyptic number.

It is an amenable number.

16806928381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16806928381 is an equidigital number, since it uses as much as digits as its factorization.

16806928381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 16806928381 in words is "sixteen billion, eight hundred six million, nine hundred twenty-eight thousand, three hundred eighty-one".