16891463725 has 6 divisors (see below), whose sum is σ = 20945415050. Its totient is φ = 13513170960.

The previous prime is 16891463723. The next prime is 16891463731. The reversal of 16891463725 is 52736419861.

It can be written as a sum of positive squares in 3 ways, for example, as 5987509641 + 10903954084 = 77379^2 + 104422^2 .

It is not a de Polignac number, because 16891463725 - 2¹ = 16891463723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16891463723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 337829250 + ... + 337829299.

Almost surely, 2^16891463725 is an apocalyptic number.

It is an amenable number.

16891463725 is a deficient number, since it is larger than the sum of its proper divisors (4053951325).

16891463725 is an equidigital number, since it uses as much as digits as its factorization.

16891463725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675658559 (or 675658554 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The spelling of 16891463725 in words is "sixteen billion, eight hundred ninety-one million, four hundred sixty-three thousand, seven hundred twenty-five".