15666003125 has 18 divisors (see below), whose sum is σ = 19590000066. Its totient is φ = 12527205000.

The previous prime is 15666003121. The next prime is 15666003131. The reversal of 15666003125 is 52130066651.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 3 ways, for example, as 7238946724 + 8427056401 = 85082^2 + 91799^2 .

It is not a de Polignac number, because 15666003125 - 2² = 15666003121 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 (15666003121) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6995756 + ... + 6997994.

It is an arithmetic number, because the mean of its divisors is an integer number (1088333337).

Almost surely, 2^15666003125 is an apocalyptic number.

It is an amenable number.

15666003125 is a deficient number, since it is larger than the sum of its proper divisors (3923996941).

15666003125 is an frugal number, since it uses more digits than its factorization.

15666003125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4503 (or 2244 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

Adding to 15666003125 its reverse (52130066651), we get a palindrome (67796069776).

The spelling of 15666003125 in words is "fifteen billion, six hundred sixty-six million, three thousand, one hundred twenty-five".