16465202581 has 2 divisors, whose sum is σ = 16465202582. Its totient is φ = 16465202580.

The previous prime is 16465202557. The next prime is 16465202591. The reversal of 16465202581 is 18520256461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16065562500 + 399640081 = 126750^2 + 19991^2 .

It is a cyclic number.

It is not a de Polignac number, because 16465202581 - 2⁵ = 16465202549 is a prime.

It is a super-2 number, since 2×16465202581² (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 (16465202521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8232601290 + 8232601291.

It is an arithmetic number, because the mean of its divisors is an integer number (8232601291).

Almost surely, 2^16465202581 is an apocalyptic number.

It is an amenable number.

16465202581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16465202581 is an equidigital number, since it uses as much as digits as its factorization.

16465202581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 16465202581 in words is "sixteen billion, four hundred sixty-five million, two hundred two thousand, five hundred eighty-one".