16858661725 has 12 divisors (see below), whose sum is σ = 21057334164. Its totient is φ = 13388481920.

The previous prime is 16858661723. The next prime is 16858661737. The reversal of 16858661725 is 52716685861.

It can be written as a sum of positive squares in 6 ways, for example, as 254019844 + 16604641881 = 15938^2 + 128859^2 .

It is not a de Polignac number, because 16858661725 - 2¹ = 16858661723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16858661723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2457694 + ... + 2464543.

It is an arithmetic number, because the mean of its divisors is an integer number (1754777847).

Almost surely, 2^16858661725 is an apocalyptic number.

It is an amenable number.

16858661725 is a deficient number, since it is larger than the sum of its proper divisors (4198672439).

16858661725 is a wasteful number, since it uses less digits than its factorization.

16858661725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4922384 (or 4922379 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 55.

The spelling of 16858661725 in words is "sixteen billion, eight hundred fifty-eight million, six hundred sixty-one thousand, seven hundred twenty-five".