478999900521 has 12 divisors (see below), whose sum is σ = 715746978180. Its totient is φ = 308321774880.

The previous prime is 478999900499. The next prime is 478999900531. The reversal of 478999900521 is 125009999874.

It can be written as a sum of positive squares in 2 ways, for example, as 103397618025 + 375602282496 = 321555^2 + 612864^2 .

It is not a de Polignac number, because 478999900521 - 2¹⁷ = 478999769449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (478999900531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 917624070 + ... + 917624591.

It is an arithmetic number, because the mean of its divisors is an integer number (59645581515).

Almost surely, 2^478999900521 is an apocalyptic number.

It is an amenable number.

478999900521 is a deficient number, since it is larger than the sum of its proper divisors (236747077659).

478999900521 is a wasteful number, since it uses less digits than its factorization.

478999900521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835248696 (or 1835248693 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 63.

The spelling of 478999900521 in words is "four hundred seventy-eight billion, nine hundred ninety-nine million, nine hundred thousand, five hundred twenty-one".