521663011 has 8 divisors (see below), whose sum is σ = 533655360. Its totient is φ = 509707968.

The previous prime is 521662987. The next prime is 521663029. The reversal of 521663011 is 110366125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521663011 - 2⁵ = 521662979 is a prime.

It is a super-2 number, since 2×521663011² = 544264594091172242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521663711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20005 + ... + 37993.

It is an arithmetic number, because the mean of its divisors is an integer number (66706920).

Almost surely, 2^521663011 is an apocalyptic number.

521663011 is a deficient number, since it is larger than the sum of its proper divisors (11992349).

521663011 is a wasteful number, since it uses less digits than its factorization.

521663011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18653.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 521663011 is about 22839.9433230470. The cubic root of 521663011 is about 805.0014845079.

The spelling of 521663011 in words is "five hundred twenty-one million, six hundred sixty-three thousand, eleven".