668610524 has 12 divisors (see below), whose sum is σ = 1182131664. Its totient is φ = 330858624.

The previous prime is 668610517. The next prime is 668610541. The reversal of 668610524 is 425016866.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 861224 + ... + 861999.

It is an arithmetic number, because the mean of its divisors is an integer number (98510972).

Almost surely, 2^668610524 is an apocalyptic number.

It is an amenable number.

668610524 is a deficient number, since it is larger than the sum of its proper divisors (513521140).

668610524 is a wasteful number, since it uses less digits than its factorization.

668610524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723324 (or 1723322 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 668610524 is about 25857.5042105769. The cubic root of 668610524 is about 874.4286987431.

The spelling of 668610524 in words is "six hundred sixty-eight million, six hundred ten thousand, five hundred twenty-four".