668775725 has 12 divisors (see below), whose sum is σ = 829726656. Its totient is φ = 534733680.

The previous prime is 668775721. The next prime is 668775739. The reversal of 668775725 is 527577866.

It is not a de Polignac number, because 668775725 - 2² = 668775721 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 (668775721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49004 + ... + 61146.

It is an arithmetic number, because the mean of its divisors is an integer number (69143888).

Almost surely, 2^668775725 is an apocalyptic number.

It is an amenable number.

668775725 is a deficient number, since it is larger than the sum of its proper divisors (160950931).

668775725 is a wasteful number, since it uses less digits than its factorization.

668775725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14356 (or 14351 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 53.

The square root of 668775725 is about 25860.6984631119. The cubic root of 668775725 is about 874.5007110703.

The spelling of 668775725 in words is "six hundred sixty-eight million, seven hundred seventy-five thousand, seven hundred twenty-five".