1668015725 has 24 divisors (see below), whose sum is σ = 2099032320. Its totient is φ = 1314702720.

The previous prime is 1668015697. The next prime is 1668015733. The reversal of 1668015725 is 5275108661.

It is not a de Polignac number, because 1668015725 - 2¹⁰ = 1668014701 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 947396 + ... + 949154.

It is an arithmetic number, because the mean of its divisors is an integer number (87459680).

Almost surely, 2^1668015725 is an apocalyptic number.

It is an amenable number.

1668015725 is a deficient number, since it is larger than the sum of its proper divisors (431016595).

1668015725 is a wasteful number, since it uses less digits than its factorization.

1668015725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309 (or 2304 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 1668015725 is about 40841.3482270113. The cubic root of 1668015725 is about 1185.9509123271.

The spelling of 1668015725 in words is "one billion, six hundred sixty-eight million, fifteen thousand, seven hundred twenty-five".