521660030 has 8 divisors (see below), whose sum is σ = 938988072. Its totient is φ = 208664008.

The previous prime is 521660023. The next prime is 521660053. The reversal of 521660030 is 30066125.

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

It is a junction number, because it is equal to n+sod(n) for n = 521659978 and 521660005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26082992 + ... + 26083011.

It is an arithmetic number, because the mean of its divisors is an integer number (117373509).

Almost surely, 2^521660030 is an apocalyptic number.

521660030 is a deficient number, since it is larger than the sum of its proper divisors (417328042).

521660030 is a wasteful number, since it uses less digits than its factorization.

521660030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52166010.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 521660030 is about 22839.8780644731. The cubic root of 521660030 is about 804.9999511336. Note that the first 4 decimals are identical.

The spelling of 521660030 in words is "five hundred twenty-one million, six hundred sixty thousand, thirty".