521294668 has 6 divisors (see below), whose sum is σ = 912265676. Its totient is φ = 260647332.

The previous prime is 521294663. The next prime is 521294723. The reversal of 521294668 is 866492125.

It is not an unprimeable number, because it can be changed into a prime (521294663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65161830 + ... + 65161837.

Almost surely, 2^521294668 is an apocalyptic number.

It is an amenable number.

521294668 is a deficient number, since it is larger than the sum of its proper divisors (390971008).

521294668 is a wasteful number, since it uses less digits than its factorization.

521294668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130323671 (or 130323669 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 521294668 is about 22831.8783283373. The cubic root of 521294668 is about 804.8119710529.

The spelling of 521294668 in words is "five hundred twenty-one million, two hundred ninety-four thousand, six hundred sixty-eight".