2125661351 has 16 divisors (see below), whose sum is σ = 2534519808. Its totient is φ = 1760073600.

The previous prime is 2125661273. The next prime is 2125661353. The reversal of 2125661351 is 1531665212.

It is a cyclic number.

It is not a de Polignac number, because 2125661351 - 2¹⁸ = 2125399207 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 (2125661353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177545 + ... + 189138.

It is an arithmetic number, because the mean of its divisors is an integer number (158407488).

Almost surely, 2^2125661351 is an apocalyptic number.

2125661351 is a deficient number, since it is larger than the sum of its proper divisors (408858457).

2125661351 is a wasteful number, since it uses less digits than its factorization.

2125661351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366742.

The product of its digits is 10800, while the sum is 32.

The square root of 2125661351 is about 46104.8950871814. The cubic root of 2125661351 is about 1285.7741555854.

The spelling of 2125661351 in words is "two billion, one hundred twenty-five million, six hundred sixty-one thousand, three hundred fifty-one".