4921668520 has 32 divisors (see below), whose sum is σ = 11099367720. Its totient is φ = 1964113920.

The previous prime is 4921668511. The next prime is 4921668527. The reversal of 4921668520 is 258661294.

It can be written as a sum of positive squares in 4 ways, for example, as 2001130756 + 2920537764 = 44734^2 + 54042^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (4921668527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124761 + ... + 159400.

Almost surely, 2^4921668520 is an apocalyptic number.

4921668520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4921668520 is an abundant number, since it is smaller than the sum of its proper divisors (6177699200).

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

4921668520 is a wasteful number, since it uses less digits than its factorization.

4921668520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284605 (or 284601 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 4921668520 is about 70154.6044105446. The cubic root of 4921668520 is about 1700.9992418377. Note that the first 3 decimals are identical.

The spelling of 4921668520 in words is "four billion, nine hundred twenty-one million, six hundred sixty-eight thousand, five hundred twenty".