2251215642125 has 8 divisors (see below), whose sum is σ = 2809517121528. Its totient is φ = 1800972513600.

The previous prime is 2251215642101. The next prime is 2251215642127. The reversal of 2251215642125 is 5212465121522.

It can be written as a sum of positive squares in 4 ways, for example, as 308776928329 + 1942438713796 = 555677^2 + 1393714^2 .

It is not a de Polignac number, because 2251215642125 - 2⁸ = 2251215641869 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 (2251215642127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9004862444 + ... + 9004862693.

It is an arithmetic number, because the mean of its divisors is an integer number (351189640191).

Almost surely, 2^{2251215642125} is an apocalyptic number.

2251215642125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2251215642125 is a deficient number, since it is larger than the sum of its proper divisors (558301479403).

2251215642125 is an equidigital number, since it uses as much as digits as its factorization.

2251215642125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18009725152 (or 18009725142 counting only the distinct ones).

The product of its digits is 96000, while the sum is 38.

The spelling of 2251215642125 in words is "two trillion, two hundred fifty-one billion, two hundred fifteen million, six hundred forty-two thousand, one hundred twenty-five".