16355445041981 has 2 divisors, whose sum is σ = 16355445041982. Its totient is φ = 16355445041980.

The previous prime is 16355445041953. The next prime is 16355445042133. The reversal of 16355445041981 is 18914054455361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16283315197081 + 72129844900 = 4035259^2 + 268570^2 .

It is a cyclic number.

It is not a de Polignac number, because 16355445041981 - 2¹⁴ = 16355445025597 is a prime.

It is a super-2 number, since 2×16355445041981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16355445041681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8177722520990 + 8177722520991.

It is an arithmetic number, because the mean of its divisors is an integer number (8177722520991).

Almost surely, 2^{16355445041981} is an apocalyptic number.

It is an amenable number.

16355445041981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16355445041981 is an equidigital number, since it uses as much as digits as its factorization.

16355445041981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368000, while the sum is 56.

The spelling of 16355445041981 in words is "sixteen trillion, three hundred fifty-five billion, four hundred forty-five million, forty-one thousand, nine hundred eighty-one".