521260016 has 10 divisors (see below), whose sum is σ = 1009941312. Its totient is φ = 260630000.

The previous prime is 521260013. The next prime is 521260037. The reversal of 521260016 is 610062125.

It is a junction number, because it is equal to n+sod(n) for n = 521259973 and 521260000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521260013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16289360 + ... + 16289391.

Almost surely, 2^521260016 is an apocalyptic number.

It is an amenable number.

521260016 is a deficient number, since it is larger than the sum of its proper divisors (488681296).

521260016 is a wasteful number, since it uses less digits than its factorization.

521260016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32578759 (or 32578753 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 521260016 is about 22831.1194644503. The cubic root of 521260016 is about 804.7941379129.

The spelling of 521260016 in words is "five hundred twenty-one million, two hundred sixty thousand, sixteen".