16207540781 has 2 divisors, whose sum is σ = 16207540782. Its totient is φ = 16207540780.

The previous prime is 16207540673. The next prime is 16207540819. The reversal of 16207540781 is 18704570261.

16207540781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14955088681 + 1252452100 = 122291^2 + 35390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16207540781 is a prime.

It is a super-2 number, since 2×16207540781² (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 (16207542781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8103770390 + 8103770391.

It is an arithmetic number, because the mean of its divisors is an integer number (8103770391).

Almost surely, 2^16207540781 is an apocalyptic number.

It is an amenable number.

16207540781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16207540781 is an equidigital number, since it uses as much as digits as its factorization.

16207540781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 16207540781 in words is "sixteen billion, two hundred seven million, five hundred forty thousand, seven hundred eighty-one".