16461526781321 has 16 divisors (see below), whose sum is σ = 16628426630160. Its totient is φ = 16295434122240.

The previous prime is 16461526781317. The next prime is 16461526781327. The reversal of 16461526781321 is 12318762516461.

It can be written as a sum of positive squares in 8 ways, for example, as 33907171321 + 16427619610000 = 184139^2 + 4053100^2 .

It is a cyclic number.

It is not a de Polignac number, because 16461526781321 - 2² = 16461526781317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16461526781327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258890885 + ... + 258954461.

It is an arithmetic number, because the mean of its divisors is an integer number (1039276664385).

Almost surely, 2^{16461526781321} is an apocalyptic number.

It is an amenable number.

16461526781321 is a deficient number, since it is larger than the sum of its proper divisors (166899848839).

16461526781321 is a wasteful number, since it uses less digits than its factorization.

16461526781321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69884.

The product of its digits is 2903040, while the sum is 53.

The spelling of 16461526781321 in words is "sixteen trillion, four hundred sixty-one billion, five hundred twenty-six million, seven hundred eighty-one thousand, three hundred twenty-one".