16015625 has 18 divisors (see below), whose sum is σ = 20507802. Its totient is φ = 12500000.

The previous prime is 16015619. The next prime is 16015669. The reversal of 16015625 is 52651061.

It can be written as a sum of positive squares in 9 ways, for example, as 1666681 + 14348944 = 1291^2 + 3788^2 .

It is not a de Polignac number, because 16015625 - 2¹⁴ = 15999241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16015594 and 16015603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 390605 + ... + 390645.

Almost surely, 2^16015625 is an apocalyptic number.

It is an amenable number.

16015625 is a deficient number, since it is larger than the sum of its proper divisors (4492177).

16015625 is an frugal number, since it uses more digits than its factorization.

16015625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 16015625 is about 4001.9526483955. The cubic root of 16015625 is about 252.0662094023.

Adding to 16015625 its reverse (52651061), we get a palindrome (68666686).

The spelling of 16015625 in words is "sixteen million, fifteen thousand, six hundred twenty-five".