16861457522 has 54 divisors (see below), whose sum is σ = 31890414663. Its totient is φ = 6663855744.

The previous prime is 16861457521. The next prime is 16861457533. The reversal of 16861457522 is 22575416861.

It can be written as a sum of positive squares in 5 ways, for example, as 643180321 + 16218277201 = 25361^2 + 127351^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=91819.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16861457521) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 16710554 + ... + 16711562.

Almost surely, 2^16861457522 is an apocalyptic number.

16861457522 is a deficient number, since it is larger than the sum of its proper divisors (15028957141).

16861457522 is an equidigital number, since it uses as much as digits as its factorization.

16861457522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060 (or 1031 counting only the distinct ones).

The product of its digits is 806400, while the sum is 47.

The spelling of 16861457522 in words is "sixteen billion, eight hundred sixty-one million, four hundred fifty-seven thousand, five hundred twenty-two".