2125126615 has 4 divisors (see below), whose sum is σ = 2550151944. Its totient is φ = 1700101288.

The previous prime is 2125126613. The next prime is 2125126621. The reversal of 2125126615 is 5166215212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2125126615 - 2¹ = 2125126613 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125126613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212512657 + ... + 212512666.

It is an arithmetic number, because the mean of its divisors is an integer number (637537986).

Almost surely, 2^2125126615 is an apocalyptic number.

2125126615 is a deficient number, since it is larger than the sum of its proper divisors (425025329).

2125126615 is an equidigital number, since it uses as much as digits as its factorization.

2125126615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425025328.

The product of its digits is 7200, while the sum is 31.

The square root of 2125126615 is about 46099.0955985039. The cubic root of 2125126615 is about 1285.6663291607. Note that the first 3 decimals are identical.

The spelling of 2125126615 in words is "two billion, one hundred twenty-five million, one hundred twenty-six thousand, six hundred fifteen".