521856066 has 16 divisors (see below), whose sum is σ = 1071921024. Its totient is φ = 169250544.

The previous prime is 521856053. The next prime is 521856079. The reversal of 521856066 is 660658125.

It is an interprime number because it is at equal distance from previous prime (521856053) and next prime (521856079).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1175130 + ... + 1175573.

It is an arithmetic number, because the mean of its divisors is an integer number (66995064).

Almost surely, 2^521856066 is an apocalyptic number.

521856066 is an abundant number, since it is smaller than the sum of its proper divisors (550064958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521856066 is a wasteful number, since it uses less digits than its factorization.

521856066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350745.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 521856066 is about 22844.1691904083. The cubic root of 521856066 is about 805.1007761905.

The spelling of 521856066 in words is "five hundred twenty-one million, eight hundred fifty-six thousand, sixty-six".