668698522 has 4 divisors (see below), whose sum is σ = 1003047786. Its totient is φ = 334349260.

The previous prime is 668698411. The next prime is 668698523. The reversal of 668698522 is 225896866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 362483521 + 306215001 = 19039^2 + 17499^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 668698522.

It is not an unprimeable number, because it can be changed into a prime (668698523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167174629 + ... + 167174632.

Almost surely, 2^668698522 is an apocalyptic number.

668698522 is a deficient number, since it is larger than the sum of its proper divisors (334349264).

668698522 is a wasteful number, since it uses less digits than its factorization.

668698522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334349263.

The product of its digits is 2488320, while the sum is 52.

The square root of 668698522 is about 25859.2057495972. The cubic root of 668698522 is about 874.4670591928.

The spelling of 668698522 in words is "six hundred sixty-eight million, six hundred ninety-eight thousand, five hundred twenty-two".