2166425451 has 24 divisors (see below), whose sum is σ = 3197179440. Its totient is φ = 1413282816.

The previous prime is 2166425389. The next prime is 2166425479. The reversal of 2166425451 is 1545246612.

2166425451 is a `hidden beast` number, since 2 + 1 + 6 + 642 + 5 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 2166425451 - 2⁷ = 2166425323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166425851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63756 + ... + 91638.

It is an arithmetic number, because the mean of its divisors is an integer number (133215810).

Almost surely, 2^2166425451 is an apocalyptic number.

2166425451 is a deficient number, since it is larger than the sum of its proper divisors (1030753989).

2166425451 is a wasteful number, since it uses less digits than its factorization.

2166425451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28075 (or 28072 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 2166425451 is about 46544.8756685416. The cubic root of 2166425451 is about 1293.9413242499.

The spelling of 2166425451 in words is "two billion, one hundred sixty-six million, four hundred twenty-five thousand, four hundred fifty-one".