16861457533 has 2 divisors, whose sum is σ = 16861457534. Its totient is φ = 16861457532.

The previous prime is 16861457521. The next prime is 16861457549. The reversal of 16861457533 is 33575416861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16460376804 + 401080729 = 128298^2 + 20027^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16861457533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16861457563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8430728766 + 8430728767.

It is an arithmetic number, because the mean of its divisors is an integer number (8430728767).

Almost surely, 2^16861457533 is an apocalyptic number.

It is an amenable number.

16861457533 is a deficient number, since it is larger than the sum of its proper divisors (1).

16861457533 is an equidigital number, since it uses as much as digits as its factorization.

16861457533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 49.

The spelling of 16861457533 in words is "sixteen billion, eight hundred sixty-one million, four hundred fifty-seven thousand, five hundred thirty-three".